Table 7

Results of the mixed-effects meta-regressions for the continuous moderator variables on the effect sizes obtained from measures of knowledge in the posttest
Cluster / Moderator variable k Min. Max. Mean SD bj QR QE(df) R2
(A) Treatment characteristics:
Treatment duration (weeks) 15 1.0 96.0 17.5 32.1 −0.012 6.60** 144.46(13)*** 0.430
Treatment intensity (hours/week) 12 0.2 2.4 0.9 0.6 −0.059 0.03 142.28(10)*** 0.0
Treatment magnitude (total hours) 12 0.2 19.0 5.0 5.0 −0.001 0.00 128.72(10)*** 0.026
(B) Subject characteristics:
Mean age (years) 14 8.0 12.0 1.2 1.2 0.130 0.48 345.18(12)*** 0.0
Gender (% male) 14 45.8 58.2 3.7 3.7 0.029 0.20 384.63(12)*** 0.0
(C) Methodological characteristics:
Differential attrition 16 0.0 0.033 0.004 0.009 −24.205 1.14 355.39(14)*** 0.0
Quality score 16 3.4 7.5 6.0 1.1 0.282 2.71 267.05(14)*** 0.177
(D) Extrinsic characteristic:
Publication year 16 1984 2011 2003 8.4 −0.014 0.28 370.92(14)*** 0.0

* 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.

Calvo-Muñoz et al.

Calvo-Muñoz et al. BMC Musculoskeletal Disorders 2012 13:152   doi:10.1186/1471-2474-13-152

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