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Table 2 Results of univariate meta-regressions for the 13 studies of cognitive behaviour therapy

From: Brief psychological therapies for anxiety and depression in primary care: meta-analysis and meta-regression

Variable Category 1 (k; N) Category 2 (k; N) Regression coefficient Standard error 95% CI P* I 2 Adj R 2
Dichotomous         
Diagnosis (model a) Anxiety = 0 (7; 497) Depression = 1 (4; 275) .72 .20 .28-1.16 .005 0% 91%
Diagnosis (model b) Anxiety = 0 (7; 497) Mixed anxiety & depression = 1 (2, 479) .80 .18 .36-1.23 .003 2% 94%
Diagnosis (model c) Depression = 0 (4; 275) Mixed anxiety & depression = 1 (2; 479) .07 .17 -.39-.53 .70 0% 0%
Country UK = 0 (12; 1214) Other = 1 (1; 37) .36 .56 -.87-1.58 1.00 71% 0%
Type of data Continuous = 0 (9; 931) Dichotomous = 1 (4; 320) -.11 .31 -.79-.58 1.00 70% 0%
Continuous Range ( k ; N )       
Number of sessions 3.7-9.8 (13; 1251) -.03 .08 -.21-.15 1.00 65% 0%
Follow up (weeks) 4-31.6 (13; 1251) .03 .02 -.003-.07 .46 67% 22%
Year of publication 1982-2004 (13; 1251) -.02 .02 -.06-.02 .89 59% 16%
Number randomized 20-429 (13; 1251) .001 .001 -.001-.004 .89 59% 7%
Attrition (intervention group) 0-37% (13; 1251) -.01 .01 -.03-.02 1.00 67% 0%
Attrition (control group) 0-33% (13; 1251) -.01 .01 -.04-.03 1.00 67% 0%
Study quality 1-4 (13, 1251) .16 .22 -.31-.64 1.00 71% 0%
  1. *P-values are adjusted for multiple testing, calculated using the Higgins and Thompson Monte Carlo permutation test (10,000 permutations), except for the diagnostic variables which are unadjusted.
  2. Adj R 2 = adjusted R 2 (proportion of between-study variance explained by the covariate); k = number of studies; N = total sample size.