Table 1.

AHRQ cross-sectional study quality evaluation standard table.

	Item content	Yes	No/Unclear
1	Define the source of information (survey or record review?)
2	List inclusion and exclusion criteria for exposed and unexposed subjects (cases and control) or refer to previous publications
3	Indicate period used for identifying patients
4	Indicate whether or not subjects were consecutive if not population-based
5	Indicate if evaluators of subjective components of the study were masked to other aspects of the status of the participants
6	Describe any assessments undertaken for quality assurance purposes (e.g., test/retest of primary outcome measurements)
7	Explain any patient exclusions from the analysis
8	Describe how confounding was assessed and/or controlled
9	lf applicable, explain how missing data were handled in the analysis
10	Summarize patient response rates and completeness of data collection
11	Clarify what follow-up, if any, was expected and the percentage of patients for which incomplete data or follow-up was obtained