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Table 2 Quality assessment

From: Trends in child and adolescent obesity prevalence according to socioeconomic position: protocol for a systematic review

Component

Questions

Assessment

Ratings

Selection bias

Are the individuals selected to participate likely to be representative of the national population?

• Very likely

Studies that are very likely to be representative and have greater than 80% participation will be rated as strong.

• Somewhat likely

• Not likely

• Cannot tell

What percentage of selected individuals agreed to participate?

• 80 to 100%

• 60 to 79%

• Less than 60%

• Can’t tell

Study design

Were study methods comparable over time?

• Yes

Studies with comparable methods over time will be rated as strong.

• No

• Cannot tell

Confounders

Were confounders (age, sex, race/ethnicity) controlled for in study design or analysis?

• Yes

Studies that control for confounding will be rated as strong.

• No

• Cannot tell

Data collection methods

Was anthropometry measured (as opposed to self reported)?

• Yes

Studies where anthropometry was measured will be rated as strong.

• No

• Cannot tell

Analyses

Are the statistical analyses appropriate to detect differences by SEP?

• Yes

Studies that have performed analyses to detect differences by SEP will be rated as strong.

• No

• Cannot tell

SEP, socioeconomic position.