Quality assessment – Case-Control (Health only).
Datasets usually provide raw data for analysis. This raw data often comes in spreadsheet form, but can be any collection of data, on which analysis can be performed.
Valid case definition provided?; 2Cases/controls representative of the general population e.g. community recruitment?; 3Power calculation; 4Systematic selection process used to select cases/controls e.g. matching, random selection, population based; 5Refusal to participate reported and reasonable; 6Exposure accurately measured; 7Exposure measured identically in cases and controls; 8Blinding used; 9Direction of the relationship explained; 10Appropriate confounders measured and accounted for; 11Measure of effect provided (e.g. OR/RR);12Confidence Intervals provided; 13P-Value provided.a
Recruitment at infertility clinics; bUnclear how many controls refused participation; cAmongst many other potential confounders, sexual behaviour, a common cause of RTIs, not accounted for; dLow (3%) refusal rate; eSelf-reported menstrual hygiene; fAlthough data collected on STIs, not clear if OR adjusted.