A sample size formula for case-control studies with an independent variable that is continuousA sample size formula for case-control studies with an independent variable that is continuous - Controlled Clinical Trialsdoi:10.1016/0197-2456(92)90129-NBruce Thompson...
Case-ControlStudy （病例对照研究）1.BasicConcepts Astudystartswiththeidentificationofpersonswiththediseaseofinterestandacontrolgroupofpersonswithoutthedisease,tomeasuretheassociationbetweentheexposureandthediseasebycomparingthediseasedandnon-diseasedwithregardedtohowfrequentlytheexposurepresent.Exposure Studysubjectscontact...
We derive several formulae for the sample size required for a study designed using the self-controlled case series method without age effects. We investigate these formulae by simulation, and identify one based on the signed root likelihood ratio statistic which performs well. We extend this metho...
The accident data of AV and HDV were compared using the matched case-control logistic regression. The impact of different variables on the potential of accidents in AV vs HDV was conducted using a matched case-control logistic regression model. Based on the model estimation results, it can be ...
(1 − p)/e2, where n is the estimated sample size, z is the reliability coefficient (1.96 at the 95% confidence level), p is the prevalence (0.282% as the prevalence of TB in the Volta Region for the year 2017; 282 per 100,000 population) (TB Control, 2017) and e is margin ...
and an attempted case to control ratio of 1:3, there was sufficient statistical power (at least 80%) at a confidence level of 95% to detect an odds ratio of 3.0, using 5%, 20% and 80% as the expected frequencies of exposure among controls. Hence, the sample size of controls was set...
Additionally, \({k}_{1}\) and \({k}_{2}\) are the numbers of columns in \({{{\bf{W}}}_{1}\) and \({{{\bf{W}}}_{2}\), respectively (\(k={k}_{1}+{k}_{2}\)), and they can be adjusted to control the dominance of the reference data on the model. The last ...
Quality control was conducted to correct obvious errors in the data set. Questionnaire data were analyzed using IBM SPSS Statistics for Windows, version 21.0 (SPSS Inc., Chicago, IL, USA). Due to categorical nature of data, we presented our result in proportion and percentage. Sample size was...
To survey the potential source of heterogeneity, we conducted meta-regression analysis using the ethnicity, mean age of control group, mean age of case group, mean BMI of case group, mean BMI of the control group, and sample size of case and control groups (N ≥ 1000 or < 1000...
Nested case-control study in which the controls are selected at each time when a case occurs (incidence density sampling) Example of a Case-Control study ? Hypothesis: xx baby formula contaminated with Melamine, as opposed to other baby formula, is a cause of kidney stones in infants 100 ...