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


Oteng-Ntim et al. BMC Medicine 2012 10:47   doi:10.1186/1741-7015-10-47

Open Data