Table 5 Power calculation

Days to first employment or beginning of education

68

45

0.0125

1.000 (t test)

Bond et al. [8] (2008),

Cognitive function

0.3

0.7

0.0125

0.989 (t test)

McGurk et al. [13] (2005)

The Brief Assessment of Cognition in Schizophrenia [32]

Function measured with Personal and Social Performance (PSP) scale [31]

7

14

0.0125

0.999 (t test)

Kawata et al. [31] (2008). Nasrallah et al. [46] (2008) (No IPS studies use PSP scale. δ is estimated)

Self-efficacy measured with General Self-Efficacy scale [37]

0.28

0.85

0.0125

0.880 (t test)

Tsang et al. [14] (2010)

Self-esteem measured with the Rosenberg Self-Esteem scale [38]

0.3

0.55

0.0125

0.992 (t test)

Mueser et al. [47] (2004), Howard et al. [18] (2010), Drake et al. [48] (1999). None of the studies shows difference in mean. σ is between 0.55 and 0.68.

Competitive employment or education during follow-up period

50 % vs. 34 %

-

0.0125

0.807 (chi-squared test)

Bond et al. [8] (2008)

Dichotomous yes/no