{"id":17391,"date":"2014-10-24T04:53:08","date_gmt":"2014-10-24T04:53:08","guid":{"rendered":"http:\/\/vskills.in\/certification\/blog\/?p=17391"},"modified":"2024-04-03T13:14:32","modified_gmt":"2024-04-03T07:44:32","slug":"biostatistics","status":"publish","type":"post","link":"https:\/\/www.vskills.in\/certification\/blog\/biostatistics\/","title":{"rendered":"Biostatistics"},"content":{"rendered":"<p><!--[if gte mso 9]&gt;--><\/p>\n<p><!--[if gte mso 9]&gt;--><\/p>\n<p style=\"text-align: center\"><a ref=\"magnificPopup\" href=\"http:\/\/vskills.in\/certification\/blog\/wp-content\/uploads\/2014\/10\/Biostatistics.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17413\" alt=\"Biostatistics\" src=\"http:\/\/vskills.in\/certification\/blog\/wp-content\/uploads\/2014\/10\/Biostatistics.jpg\" width=\"261\" height=\"193\" \/><\/a><\/p>\n<p><span><span>1.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Introduction<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 72.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>a.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Biostatistics is the study of statistics as applied to the biological area. Biological laboratory experiments, medical research (including clinical research) and health services research use statistical methods. Why should one study biostatistics rather than statistics, since the methods have wide applicability? There are 3 reasons for focusing on biostatistics.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>i.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Some statistical methods are more heavily used in biostatistics than in other fields. For example, a general statistical text book would not discuss the life-table method of analysing survival data-of importance in many bio statistical applications.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>ii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Examples can be drawn from the biological, medical as well as health care areas. This helps you maintain motivation. It also helps you understand how to apply statistical methods.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>iii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A third reason for a bio statistical text is to teach the material to an audience of health professionals.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"text-align: justify\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">\u00a0<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 36.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>2.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Bio statistical design of medical studies<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 72.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>a.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">The study of statistics should serve to develop critical, analytical thought and \u201ccommon sense\u201d as well as to introduce specific tools and methods of processing data.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 72.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>b.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Biomedical studies can arise in many ways. A particular study may result from a sequence of experiments, each one leading naturally to the next.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 72.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>c.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">The study may be instigated by a governmental agency in response to a question of national importance. Many of the critical studies and experiments in biomedical science have come from one individual with an idea for a radical interpretation of past data.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 72.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>d.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Statistical considerations may suggest that an experiment is too expensive to conduct, or may suggest a different approach than at first planned. The need to statistically evaluate the data from a study forces an investigator to sharpen the focus of the study. It makes one translate intuitive ideas into an analytical model capable of generating data that may be evaluated statistically.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 72.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>e.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">In laboratory research, many different experiments may shed light upon a given hypothesis or a question. Sometimes less-than-optimal execution of a well-conceived experiment sheds more light than arduous and excellent experimentation unimaginatively designed.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"text-align: justify\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">\u00a0<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 36.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>3.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Some different types of studies<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 72.0pt;text-align: justify;text-indent: -18.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span>a.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A problem may be investigated in a variety of different ways. To decide upon your method of approach, it is necessary to understand the types of studies that might be done. To facilitate the discussion of design, we introduce definitions of commonly used types of studies,<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>i.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">An <i>observational study<\/i> collects data from an existing situation. The data collection does not intentionally interfere with the running of the system.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>ii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">An <i>experiment<\/i> is a study in which the investigator deliberately sets one or more factors to a specific level.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>iii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>laboratory experiment<\/i> is an experiment which takes place in an environment (called the laboratory) where experimental manipulation is facilitated.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>iv.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>comparative experiment<\/i> is an experiment which compares two or more techniques, treatments or levels or some variable.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>v.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">An <i>experimental unit or study unit<\/i> if the smallest unit upon which the experiment or study is performed.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>vi.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">An experiment is a <i>cross-over experiment<\/i> is the same experimental unit receives more than one treatment, or is investigated under more than one condition of the experiment.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>vii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>clinical study<\/i> is one which takes place in the setting if clinical medicine.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>viii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>cohort<\/i> of people is a group of people whose membership is clearly defined.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>ix.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">An <i>endpoint<\/i> is a clearly-defined outcome or event associated with an experimental or study unit.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>x.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>prospective study<\/i> is one in which a cohort of people is followed for the occurrence or non-occurrence of specified endpoints or events or measurements.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>xi.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><i><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">Baseline characteristics<\/span><\/i><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"> or <i>baseline variables<\/i> are values collected at the time of entry into the study.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>xii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>retrospective study<\/i> is one in which individuals having a particular outcome or endpoint are identified and studied.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>xiii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>case control study<\/i> selects all cases, usually of a disease which meet a fixed criteria. A comparison group for the cases, called <i>controls<\/i> is also selected.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>xiv.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">In a <i>matched case control study<\/i> controls are selected to match characteristics of individual cases.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>xv.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>longitudinal study <\/i>collects information on study units over a specified time interval. A <i>cross-sectional study<\/i> collects data on study units at some fixed time.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>xvi.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A <i>placebo<\/i> treatment is designed to appear exactly like a comparison treatment, but to be devoid of the active part of the treatment.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>xvii.<\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">The <i>placebo effect<\/i> results from the knowledge that one is treated, rather than changes due to physical, physiological and chemical activity of a treatment.<\/span><\/p>\n<p class=\"MsoNoSpacing\" style=\"margin-left: 108.0pt;text-align: justify;text-indent: -108.0pt\"><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\"><span><span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>xviii.<span style=\"font: 7.0pt 'Times New Roman'\">\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><span style=\"font-size: 12.0pt;font-family: 'Times New Roman',serif\">A study is <i>single blind<\/i> if treated subjects are unaware of which treatment (including any control) they are receiving. A study is said to be <i>double blind<\/i> if it is single blind and the individuals evaluating the outcome variables are also unaware of which treatment the subjects are receiving.<br \/>\n<\/span><\/p>\n<p><!--[if gte mso 9]&gt;--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.\u00a0\u00a0\u00a0\u00a0\u00a0 Introduction a.\u00a0\u00a0 Biostatistics is the study of statistics as applied to the biological area. Biological laboratory experiments, medical research (including clinical research) and health services research use statistical methods. Why should one study biostatistics rather than statistics, since the methods have wide applicability? There are 3 reasons for focusing on biostatistics. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 i.\u00a0\u00a0\u00a0\u00a0\u00a0 Some&#8230;<\/p>\n","protected":false},"author":46,"featured_media":17413,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1552],"tags":[1025,1024,931],"class_list":["post-17391","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-quality-2","tag-biology","tag-biostatistics","tag-statistics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Biostatistics - 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