Table 4 Assessment of the quality of the included trials: non-randomised trials
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 |