Table 3.

Between-group effect sizes, results of the mixed models with and without covariates.

Measure	Between-group ESa–T2			Between-group ESa–T3			Between-group ESa–T4			Between-group ESa–T5			Fixed effect time x group				Fixed effect time x group
	Cohen d	95% CI	Cohen d		95% CI	Cohen d		95% CI	Cohen d		95% CI	Base model estimate (SE)		t value (df)	P value	Covariate model estimate (SE)		t value (df)	P value
IDS-SRb	0.192	−0.020 to 0.404	0.281		0.069-0.493	0.030		−0.182 to 0.241	−0.025		−0.236 to 0.186	−2.486 (0.987)		−2.519 (1186.2)	.01	−2.975 (1.098)		−2.710 (941.3)	.007
SF-12 MCSc	−0.343	−0.555 to −0.130	−0.249		−0.461 to −0.037	−0.260		−0.472 to −0.048	−0.070		−0.141 to 0.281	3.553 (0.985)		3.608 (1198.4)	<.001	3.531 (1.111)		3.180 (945.7)	.002
SF-12 PCSd	−0.075	−0.286 to 0.136	−0.205		−0.416 to 0.007	−0.287		−0.499 to −0.075	−0.123		−0.334 to 0.088	0.794 (0.835)		0.950 (1161.1)	.34	0.837 (0.938)		0.892 (932.5)	.37

^aES: effect size; between-group effect sizes were corrected for unequal sample size and could therefore also be referred to as Hedges g. Effect sizes are calculated based on imputed values to make use of the full data set. Positive values indicate a higher score in the PMR group, and negative values indicate higher scores in the iFD group.

^bIDS-SR: Inventory of Depressive Symptomatology–self-rating.

^cSF-12 MCS: Short-Form 12 mental component score.

^dSF-12 PCS: Short-Form 12 physical component score.