Trial ID	Outcome	High risk of bias (category A)a	High risk of bias (category D)b	High risk of bias (category E)c	High risk of bias (category G)d
Ensor 2015	Body weight	Yes	No	No	No
	Anthropometric measures other than body weight (kg)	Yes	No	No	No
Barriocanal 2008	Body weight	Yes	No	No	No
	Anthropometric measures other than body weight (kg)	Yes	No	No	No
Maki 2008	NA
Grotz 2003	HbA1c	Yes	No	No	No
	Adverse events	Yes	No	No	No
Colagiuri 1989	NA
Cooper 1988	NA
Chantelau 1985	NA
Nehrling 1985	NA
Stern 1976	Glucose levels, fasting	No	No	Yes	No
aClear that outcome was measured and analysed; trial report stated that outcome was analysed but reported only that result was not significant (Classification 'A', table 2, Kirkham 2010). bClear that outcome was measured and analysed; trial report stated that outcome was analysed but reported no results ( Classification 'D', table 2, Kirkham 2010). cClear that outcome was measured but was not necessarily analysed; judgement says likely to have been analysed but not reported because of non‐significant results (Classification 'E', table 2, Kirkham 2010). dUnclear whether outcome was measured; not mentioned, but clinical judgement says likely to have been measured and analysed but not reported on the basis of non‐significant results (Classification 'G', table 2, Kirkham 2010). HbA1c: glycosylated haemoglobin A1c; NA: not applicable.