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Table 4 Assessment of the quality of the included trials: non-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 Incomplete outcome data Contamination Sample size Grade of quality
Gray-Donald et al. (2000) [38] Yes: Registered from clinic No No No No: non-parallel control 219 Low
Olson et al. (2004) [51] Yes No No No No: non-parallel control 560 Low
Claesson et al. (2007) [36] Yes: Registered from clinic No No Yes No: selected from nearby city 315 Low
Kinnunen et al. (2007) [37] Yes No No No Yes 55 Low
Shirazian et al., (2010) [39] Yes No No Yes No: non-parallel control 28 Low
Mottola et al., (2010) [35] Yes No No Yes No: non-parallel control 65 Low