Table 3. Comparison of mean (sd) results in the intervention group subjects and control group subjects who completed both the baseline and the 6-month follow-up assessments.
| scale | control group | intervention group | comparison of control and intervention groups | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | baseline | at 6 months | paired t-test (p) | n | baseline | at 6 months | paired t-test (p) | at baseline t-test (p) | at 6 months t-test (p) | at 6 months F-test (p)a | |||
| PHQ-9 | 1239 | 2.39 (3.42) | 3.04 (3.44) | 5.64 (<0.001) | 3039 | 1.90 (3.17) | 1.81 (3.25) | 1.30 (0.194) | 4.36 (<0.001) | 10.81 (<0.001) | 9.98 (<0.001) | ||
| GAD-7 | 1239 | 1.16 (2.36) | 1.74 (2.58) | 6.67 (<0.001) | 3039 | 0.88 (2.11) | 0.73 (1.96) | 3.41 (0.001) | 3.65 (<0.001) | 12.48 (<0.001) | 12.85 (<0.001) | ||
| SF-12-PCS | 1207 | 44.9 (8.7) | 45.1 (8.0) | 0.44 (0.664) | 2954 | 46.2 (8.4) | 46.0 (8.5) | 1.55 (0.121) | 4.26 (<0.001) | 3.26 (0.001) | 1.03 (0.306) | ||
| SF-12-MCS | 1207 | 54.4 (8.8) | 51.9 (8.5) | 8.03 (<0.001) | 2954 | 55.6 (8.3) | 56.5 (7.5) | 5.28 (<0.001) | 3.87 (<0.001) | 16.46 (<0.001) | 16.13 (<0.001) | ||
PHQ-9,9-item Patient Health Questionnaire[13]
GAD-7,7-item General Anxiety Disorder scale[14]
SF-12-PCS, Physical Component Summary score computed by weighting items of the 12-item Short Form Health Survey[15]
SF-12-MCS, Mental Component Summary score computed by weighting items of the 12-item Short Form Health Survey[15]
aF-test for analysis of covariance that controls for baseline value and for demographic variables that were different at baseline (i.e., occupation, occurrence of sequelae, and hospital-based treatment in prior 6 months).