Assessment of how researchers dealt with confounding
Method for identifying relevant confounders described by researchers:	Yes	□
	no	□
If yes, describe the method used:
Relevant confounders described:	yes	□
	no	□
List confounders described on next page
Method used for controlling for confounding
‘At design stage (e.g. matching, regression discontinuity, instrument variable):
………………………………………
………………………………………
………………………………………
At analysis stage (e.g. stratification, regression, difference‐indifference):
………………………………………
………………………………………
………………………………………
Describe confounders controlled for below