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. 2012 Jan 17;30(5):539–547. doi: 10.1200/JCO.2011.37.0437

Table 3.

Mean Effect Sizes and Moderator Analyses (k = 38)

Parameter k Effect Size (g) 95% CI P Heterogeneity
Mean effect size
    Pain severity* 38 0.34 0.23 to 0.46 < .001 I2 = 60.1, P < .001
    Pain interference 4 0.40 0.21 to 0.60 < .001 I2 = 0.001, P = .74
Categorical moderators (pain severity)
    Intervention type
        Skills based 18 0.45 0.21 to 0.69 .22
        Educational 19 0.29 0.19 to 0.39
    Pain as study outcome
        Primary 32 0.37 0.24 to 0.50 .26
        Secondary 6 0.24 0.06 to 0.42
    Presence of pain required for eligibility
        No 14 0.33 0.06 to 0.59 .94
        Yes 24 0.34 0.22 to 0.45
    Delivery setting
        Clinic only 24 0.25 0.10 to 0.40 .08
        Home 8 0.43 0.29 to 0.58
Continuous moderators (pain severity)
    No. of treatment sessions 38 B = 0.002 .76
    Percentage of women to men participants 35 B = 0.001 .77
    Percentage of minority participants (US studies only) 19 B = 0.001 .50
*

All studies fall within 2 standard deviations of the mean effect size.

Goodwin et al34 was removed for this analysis because it was the only intervention primarily based on social support.