Table 3.
Prediction of responsiveness from internal consistency reliability
| Study | Dependent variable | Independent variables | Constant | Regression coefficient (p-value) | R2 |
| All studies | SRM | Cronbach's alpha | 0.25 | 0.41 (0.59) | 0.01 |
| SRM | Cronbach's alpha | 0.66 | 0.13 (0.83) | 0.37 | |
| Type of instrument* | -0.40 (0.01) | ||||
| Study 1 | SRM | Cronbach's alpha | -0.09 | 0.90 (0.30) | 0.07 |
| SRM | Cronbach's alpha | -0.07 | 1.04 (0.18) | 0.32 | |
| Type of instrument* | -0.25 (0.04) | ||||
| Study 2 | SRM | Cronbach's alpha | 0.94 | -0.64 (0.46) | 0.03 |
| SRM | Cronbach's alpha | 0.52 | -0.02 (0.98) | 0.48 | |
| Type of instrument* | -0.29 (<0.01) | ||||
| Study 3 | SRM | Cronbach's alpha | -0.51 | 1.88 (0.11) | 0.29 |
| SRM | Cronbach's alpha | 1.42 | -0.45 (0.74) | 0.60 | |
| Type of instrument* | -0.59 (0.05) | ||||
| Study 4a | SRM | Cronbach's alpha | -1.81 | 2.94 (0.013) | 0.39 |
| SRM | Cronbach's alpha | -0.46 | 1.58 (0.15) | 0.60 | |
| Type of instrument* | -0.37 (0.03) | ||||
| Study 4b | SRM | Cronbach's alpha | -2.61 | 3.52 (0.03) | 0.32 |
| SRM | Cronbach's alpha | -0.43 | 1.36(0.22) | 0.74 | |
| Type of instrument* | -0.48 (<0.01) |
SRM: standardised response mean
* Disease-specific or generic