Table 2.

Quality assessment of 54 included studies

Author	Abstract and title	Intro and aims	Method and data	Sampling	Data analysis	Ethics and bias	Results	Transferability	Implications and usefulness
Abatemarco et al38	Good	Good	Fair	Good	Fair	Fair	Poor	Good	Good
Amarin39	Poor	Fair	Poor	Poor	Poor	Poor	Poor	Poor	Fair
Bakker et al40	Fair	Fair	Fair	Fair	Fair	Poor	Fair	Fair	Fair
Bar-Zeev et al37	Good	Good	Good	Good	Fair	Fair	Good	Fair	Good
Beenstock et al41	Good	Good	Good	Good	Good	Fair	Good	Good	Good
Berrueta et al42	Fair	Fair	Fair	Good	Fair	Fair	Good	Good	Good
Bonollo et al43	Good	Good	Good	Fair	Good	Good	Fair	Fair	Fair
Bull and Whitehead44	Fair	Fair	Fair	Fair	Fair	Good	Good	Fair	Good
Castrucci et al45	Fair	Fair	Fair	Fair	Fair	Very poor	Fair	Fair	Fair
Chang et al46	Good	Good	Good	Fair	Fair	Good	Fair	Fair	Fair
Chang et al47	Fair	Good	Good	Fair	Good	Good	Fair	Fair	Good
Clasper and White48	Fair	Fair	Fair	Fair	Fair	Fair	Fair	Fair	Fair
Coleman-Cowger et al49	Good	Fair	Good	Good	Fair	Very poor	Fair	Fair	Good
Condliffe et al50	Good	Fair	Good	Fair	Fair	Fair	Fair	Fair	Fair
Cooke et al51	Good	Fair	Fair	Good	Good	Fair	Good	Good	Good
Cooke et al90	Fair	Fair	Fair	Fair	Good	Fair	Fair	Fair	Fair
Eiser et al52	Fair	Fair	Fair	Fair	Fair	Poor	Fair	Fair	Fair
England et al53	Good	Good	Fair	Good	Good	Good	Good	Good	Good
Floyd et al54	Fair	Fair	Fair	Poor	Fair	Fair	Fair	Poor	Fair
Glover et al55	Fair	Fair	Poor	Fair	Poor	Fair	Fair	Fair	Fair
Grangé et al56	Poor	Fair	Poor	Fair	Fair	Poor	Fair	Fair	Fair
Grimley et al57	Good	Good	Good	Good	Fair	Good	Good	Fair	Good
Hartmann et al58	Good	Good	Good	Fair	Fair	Good	Good	Fair	Fair
Helwig et al59	Good	Fair	Fair	Fair	Fair	Fair	Fair	Fair	Fair
Herbert et al60	Fair	Fair	Fair	Fair	Fair	Fair	Fair	Fair	Fair
Hickner et al61	Fair	Poor	Fair	Fair	Fair	Poor	Fair	Fair	Fair
Hoekzema et al62	Good	Good	Good	Good	Fair	Fair	Good	Good	Fair
Howard et al63	Good	Good	Good	Good	Good	Good	Good	Fair	Good
Jones64	Good	Good	Fair	Fair	Fair	Fair	Fair	Fair	Fair
Jordan et al65	Fair	Fair	Fair	Fair	Fair	Poor	Fair	Fair	Good
Lemola et al66	Good	Good	Good	Good	Good	Fair	Good	Good	Good
Mabbutt et al67	Good	Good	Fair	Poor	Fair	Fair	Good	Poor	Fair
McEwen et al68	NA	NA	NA	NA	NA	NA	NA	NA	NA
Mejia et al69	Good	Fair	Fair	Good	Fair	Poor	Fair	Fair	Good
Moran et al70	Fair	Good	Good	Good	Good	Poor	Good	Good	Good
Mullen et al71	Fair	Good	Fair	Fair	Good	Poor	Fair	Fair	Fair
Murphy et al72	Fair	Fair	Fair	Good	Fair	Good	Fair	Good	Good
Oncken et al73	Good	Fair	Good	Good	Good	Poor	Good	Good	Fair
Owen and McNeill74	Poor	Fair	Poor	Very poor	Poor	Poor	Poor	Fair	Fair
Passey et al75	Good	Fair	Fair	Fair	Fair	Fair	Fair	Fair	Good
Passey and Sanson-Fisher76	Fair	Fair	Good	Fair	Fair	Fair	Fair	Fair	Fair
Passey et al77	Fair	Fair	Fair	Fair	Good	Fair	Good	Fair	Good
Price et al78	Good	Fair	Good	Fair	Good	Poor	Good	Fair	Good
Price et al79	Good	Fair	Fair	Fair	Fair	Fair	Fair	Fair	Fair
Pullon et al80	Fair	Fair	Fair	Fair	Fair	Poor	Fair	Fair	Fair
Röske et al81	Good	Good	Fair	Good	Good	Fair	Good	Good	Fair
Solberg et al82	Good	Good	Good	Good	Good	Good	Good	Good	Good
Tappin et al83	Fair	Fair	Fair	Good	Poor	Fair	Fair	Fair	Fair
Thyrian et al84	Good	Good	Good	Good	Good	Good	Good	Good	Good
Tong et al85	Good	Good	Fair	Good	Fair	Poor	Fair	Good	Fair
Tran et al86	Good	Fair	Good	Good	Good	Fair	Good	Good	Good
Tzelepis et al87	Good	Fair	Good	Good	Good	Good	Good	Good	Good
Walsh et al88	Good	Fair	Good	Fair	Fair	Fair	Good	Fair	Fair
Zapka et al89	Good	Fair	Good	Fair	Good	Fair	Good	Fair	Fair

NA, not applicable as was a letter to the editor.