Table 4 |
|||||||||
| Results of the mixed-effects meta-regressions for the continuous moderator variables on the effect sizes obtained from measures of behaviours in the posttest | |||||||||
| Cluster / Moderator variable | k | Min. | Max. | Mean | SD | bj | QR | QE(df) | R2 |
| (A) Treatment characteristics: | |||||||||
| Treatment duration (weeks) | 13 | 1.0 | 96.0 | 20.4 | 33.8 | 0.001 | 0.02 | 283.61(11)*** | 0.0 |
| Treatment intensity (hours/week) | 10 | 0.2 | 1.0 | 0.6 | 0.4 | 1.784 | 3.51a | 199.91(8)*** | 0.0 |
| Treatment magnitude (total hours) | 10 | 0.2 | 6.0 | 3.2 | 2.5 | 0.324 | 4.87* | 192.62(8)*** | 0.0 |
| (B) Subject characteristics: | |||||||||
| Mean age (years) | 11 | 10.0 | 12.0 | 11.0 | 0.7 | −0.662 | 1.84 | 251.97(9)*** | 0.0 |
| Gender (% male) | 11 | 43.3 | 58.2 | 50.1 | 5.2 | −0.033 | 0.29 | 253.92(9)*** | 0.0 |
| (C) Methodological characteristics: | |||||||||
| Differential attrition | 13 | 0.0 | 0.033 | 0.003 | 0.009 | 11.265 | 0.14 | 272.07(11)*** | 0.0 |
| Quality score | 13 | 5.0 | 6.5 | 6.1 | 0.6 | 1.040 | 5.87* | 259.63(11)*** | 0.035 |
| (D) Extrinsic characteristic: | |||||||||
| Publication year | 13 | 1984 | 2011 | 2000 | 8.4 | 0.036 | 1.20 | 282.19(11)*** | 0.0 |
ap = .06. * p < .05. ** p < .01. *** p < .001. k: number of studies. Min. and Max.: minimum and maximum values of the moderator variable. SD: standard deviation of the moderator variable. bj: unstandardized regression coefficient associated to the moderator variable. QR: statistic for testing the significance of the moderator variable. QE: statistic for testing the model misspecification. df: degrees of freedom. R2: proportion of variance accounted for by the moderator variable. The statistical analyses here presented were carried out excluding the Méndez and Gómez’s (2001) d index of 13.033 [20].
Calvo-Muñoz et al. BMC Musculoskeletal Disorders 2012 13:152 doi:10.1186/1471-2474-13-152
