Table 1.

Items from the STROBE checklist for cross-sectional studies that are relevant for prevalence studies

Item	Item no	Recommendation in STROBE checklist for cross-sectional studies
Setting	5	Describe the setting, locations and relevant dates, including periods of recruitment, exposure, follow-up and data collection
Participants	6a	Give the eligibility criteria, and the sources and methods of selection of participants
Variables	7	Clearly define all outcomes, exposures, predictors, potential confounders and effect modifiers. Give diagnostic criteria, if applicable
Data sources/measurement	8	For each variable of interest, give sources of data and details of methods of assessment (measurement). Describe comparability of assessment methods if there is more than one group.
Statistical methods	12c	Explain how missing data were addressed
	12d	If applicable, describe analytical methods taking account of sampling strategy
Participants	13a	Report numbers of individuals at each stage of study—eg numbers potentially eligible, examined for eligibility, confirmed eligible, included in the study, completing follow-up and analysed
	13b	Give reasons for non-participation at each stage

STROBE, Strengthening the Reporting of Observational Studies in Epidemiology.