Table 2.

Criteria for depression and possible biases in MRR

Year	Authors	Criteria for depression	Possible biases
2009	Carroll et al	International classification of disease (ICD-9) diagnostic coding for mood disorder (including depressive and bipolar disorders): 296.00 to 296.89	Depressed patients without diagnostic reported Depressed patients diagnosed but code not reported
2011	Carroll et al	ICD-9 diagnostic coding for mood disorder (including depressive and bipolar disorders): 296.00 to 296.89	Depressed patients without diagnostic reported Depressed patients diagnosed but code not reported
2015	Mann-Jiles et al	Reported symptoms related to depression	Other symptoms related to depression were treated separately, for example Anhedonia, Hyper- or hypophagia Insomnia Sleep/wake disturbance A list of symptoms is not enough to hypothesised depression: risk of under- or overestimation
2016	Fayand et al	Diagnostic coding, then Confirmation with medical records by: Mention of opinion, Medical monitoring, Or psychiatric treatment	Depressed patients without diagnostic reported Depressed patients diagnosed but code not reported