Table 8.
Results of independent t tests comparing observed changes over time (3-month follow-up – baseline) in trial outcome variables for line managers.
| Outcome | Intervention group | Control group | t test (df) | P value | Mean difference (95% CI BCaa) | Cohen d (95% CI BCa) | |||||||
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|
Change, mean (SD) | Participants, n (%) | Change, mean (SD) | Participants, n (%) |
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| Confidence to create a psychologically healthy workplace | 3.8 (3.2) | 86 (96) | 0.6 (3.2) | 71 (100) | 6.4 (155) | <.001 | 3.3 (2.2-4.3) | 1.0 (0.7-1.4) | |||||
| Mental health knowledge | 1.9 (3.0) | 85 (94) | 0.2 (2.9) | 71 (100) | 19.6 (154) | <.001 | 1.7 (0.8-2.6) | 3.1 (2.7-3.6) | |||||
| Psychological well-being | 3.6 (8.3) | 84 (93) | −0.7 (7.7) | 71 (100) | 3.3 (153) | .003 | 4.30 (1.9-6.8) | 0.53 (0.2-0.9) | |||||
| Mental health literacy at work | 11.8 (8.9) | 84 (93) | 0.8 (6.2) | 69 (97) | 9.0 (147.5)b | <.001b | 11.1 (8.6-13.4) | 1.4 (1.1-1.8) | |||||
| SMCITc—being respectful and responsible | 2.9 (5.5) | 84 (93) | −0.4 (3.9) | 70 (99) | 4.4 (149.1)b | <.001 | 3.3 (1.9-4.9) | 0.7 (0.4-1.0) | |||||
| SMCIT—managing and communicating existing and future work | 5.5 (6.9) | 86 (96) | −0.6 (5.8) | 68 (96) | 5.8 (152) | <.001 | 6.1 (4.1-8.2) | 0.95 (0.6-1.3) | |||||
| SMCIT—managing the individual within the team | 3.1 (5.1) | 84 (93) | −1.4 (4.25) | 71 (100) | 5.9 (153) | <.001 | 4.46 (3.0-6.0) | 0.9 (0.6-1.3) | |||||
| SMCIT—reasoning and managing difficult situations | 3.5 (4.4) | 86 (96) | −0.3 (4.7) | 71 (100) | 5.3 (155) | <.001 | 3.8 (2.4-5.3) | 0.85 (0.2-1.2) | |||||
aBCa: bias corrected and accelerated.
bSignificant Levene test; unequal variances reported.
cSMCIT: Stress Management Competency Indicator Tool.