Table 2.
Methodological quality of the studies included
| A | B | C | D | E | F | G | H | I | |
|---|---|---|---|---|---|---|---|---|---|
| a | b | ||||||||
| Singh et al. (2012) | Unclear | Unclear | Unclear | Unclear | Yes | Yes | Yes | No | 0 |
| Thomsen et al. (2012) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 4 |
| Song et al. (2012a) | Unclear | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | 3 |
| Kim et al. (2010a) | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 2 |
| Kim et al. (2010b) | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 5 |
A Author
B Adequate sequence generation
C Allocation concealment
D Binding
a Patient
b Assessor
E Baseline comparability
F Inclusion /exclusion criteria
G Similarity of postoperative program
H Sample size calculation
I Loss to follow-up