TABLE 3.

Intention-to-Treat Mixed Effects Linear Regression Analysis for Mean Levels of Psychological Capital for the Intervention Groups at Baseline (n = 297) and Post-Intervention (n = 147)

Intervention Group	Baseline Mean (SE)*	Post-Intervention Mean (SE)*	Change Mean (95% CI)†	Diff (95% CI)†
Active control	51.8 (0.7)	50.8 (1.0)	−1.0 (−2.7, 0.7)	0.0
Self-admin.	51.4 (0.7)	50.0 (0.9)	−1.4 (−3.3, 0.5)	−0.4 (−2.9, 2.2)
Self-admin. + telephone	51.2 (1.0)	53.2 (0.9)	2.0 (−0.4, 4.4)	3.0 (0.1, 6.0)‡

^*Mean (SE), mean (standard error).

^†95% CI, 95% confidence interval.

^‡Significant absolute difference (P < 0.05) between baseline and post-intervention (P < 0.05) in mean change in psychological capital scores. Results were adjusted for sex, age sex and education and weighted for inverse probability of non-response.