Study | A | B | C | D | E | F | G | H | I | J | Total |
---|
Ng, Heesch et al.[50] | + | + | + | + | - | - | + | + | + | ? | 7 |
Talbot et al.[51] | + | + | + | + | - | ? | + | - | + | - | 6 |
McDonough et al.[53] | + | + | + | + | - | ? | + | + | + | + | 8 |
Krein et al.[54] | + | + | + | + | + | + | + | + | + | + | 10 |
Hiyama et al.[55] | + | + | + | + | + | + | + | - | - | + | 8 |
Fontaine and Haaz[49] | ? | + | + | - | ? | ? | + | - | ? | ? | 3 |
Toda et al.[52] | ? | + | + | + | + | ? | + | - | - | ? | 5 |
- A: Randomization, B: Control condition, C: Research groups comparable at commencement, D: Dropout described and acceptable, E: measurements blinded, G: Respondent blinded, H: length of the follow-up, I: Intention to treat-analysis, J: Control for potential confounders.