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Table 5 Assessment quality of included trials: randomised trials

From: Lifestyle interventions for overweight and obese pregnant women to improve pregnancy outcome: systematic review and meta-analysis

Author (year) Population representativeness Adequacy of sequence generation Masking/selection bias Intention to treat Incomplete outcome data Loss to follow up Sample size Grade of quality
Polley et al. 2002 [32] Yes Yes: No Not reported No Yes 120 Low
Hui et al. (2006) [33] Yes: from clinic Exact method not described No Not reported No Yes 52 Low
Wolff et al., 2008 [30] Yes Yes: computer generated No Not reported Yes Yes 50 Low
Jeffries et al., 2009 [28] Yes Yes: Opaque envelope Yes Not reported Yes Yes 286 Low
Ong et al., 2009 [42] Yes Exact method not described No Not reported No No 12 Low
Barakat et al., 2011 [41] Yes Yes Yes Yes Yes Yes 160 Medium
Asbee et al. 2009 [27] Yes Yes No Not reported Yes No 100 Low
Thornton et al., 2009 [29] Yes Yes Yes Not reported Yes Yes 257 Medium
Guelinckx et al., 2010 [26] Not reported Randomised but not reported how Not reported Not reported Yes Not reported 99 Low
Phelan et al., 2011 [34] Yes Yes: Opaque envelope Yes Yes Yes Yes 401 Medium,
Quinlivan et al., 2011 [59] Yes Yes: Opaque envelope Yes Yes Yes Yes 124 Medium
Luoto et al., 2011 [43] Yes Yes Yes Yes Yes Yes 399 Medium
Nascimento et al., 2011 [44] Yes Yes: Opaque envelope Yes Yes Yes Yes 82 Low