Table 4 Results of quality assessment of accepted trials
Article | DS | Selection bias | Detection/Performance bias | Attrition bias | Trial outcome | ||
|---|---|---|---|---|---|---|---|
| Â | Â | Randomization | Baseline data | Blinding/Masking | Loss-to-follow up | Run-in phase | Â |
Oba et al., 2009 [32] | 01 | 0 | 0 | 0 | A | A | A |
Barja-Fidalgo et al., 2009 [33] | 02 | 0 | A | 0 | A | A | A |
| Â | 03 | 0 | A | 0 | A | A | A |
Karlzén-Reuterving and van Dijken, 1995 [20] | 04 | 0 | 0 | 0 | A | A | A |
Arrow and Riordan, 1995 [21] | 05 | 0 | 0 | 0 | A | A | A |
Williams et al., 1996 [22] | 06 | 0 | 0 | 0 | B | A | A |
| Â | 07 | 0 | 0 | 0 | A | A | A |
Rock et al., 1996 [23] | 08 | 0 | 0 | 0 | A | A | A |
| Â | 09 | 0 | 0 | 0 | A | A | A |
| Â | 10 | 0 | 0 | 0 | B | A | A |
| Â | 11 | 0 | 0 | 0 | A | A | A |
Kerrvanto-Seppälä et al., 2008 [24] | 12 | 0 | 0 | 0 | B | A | A |
Beiruti et al., 2006 [26] | 15 | 0 | A | 0 | A | A | A |
| Â | 16 | 0 | A | 0 | A | A | A |
| Â | 17 | 0 | A | 0 | B | A | A |
| Â | 18 | 0 | A | 0 | B | A | A |
| Â | 19 | 0 | A | 0 | A | A | A |
Poulsen et al., 2006 [27] | 20 | 0 | 0 | 0 | A | A | A |
| Â | 21 | 0 | 0 | 0 | A | A | A |
Forss and Halme, 19981 [28] | 22 | 0 | 0 | 0 | A | A | A |
Mejà re and Mjör, 1990 [29] | 24 | 0 | 0 | 0 | B | A | A |
| Â | 25 | 0 | 0 | 0 | B | A | A |
Boksmann et al., 1987 [30] | 26 | 0 | 0 | 0 | A | A | A |
Poulsen et al., 2001 [31] | 27 | 0 | 0 | 0 | A | A | A |
Forss et al., 19941 [37] | 28 | 0 | 0 | 0 | A | A | A |
Williams and Winter, 1981 [38] | 30 | 0 | 0 | 0 | 0 | A | A |
Songpaisan et al., 1995 [25] | 13 | 0 | A | 0 | n.e. | A | 0 |
| Â | 14 | 0 | A | 0 | n.e. | A | 0 |
Forss and Halme, 19981 [28] | 23 | 0 | 0 | 0 | n.e. | A | 0 |
Forss et al., 19941 [37] | 29 | 0 | 0 | 0 | n.e. | A | 0 |