Table 3.
Post-Intervention Comparison of the Work and Health Initiative (WHI) Treatment Group and Usual Care Group
| WHI Treatment | Usual Care (N=27) | Difference Between Change Scores | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Baseline (N=52) | Follow-up (N=47) | Change | Baseline (N=27) | Follow-up (N=25) | Change | |||||||||||||
| Mean | SD | Mean | SD | Mean | Effect Size | DF | Mean | SD | Mean | SD | Mean | Effect Size | DF | Δ | Effect Size | P-Value | DF | |
| WLQ Scores | ||||||||||||||||||
| Time Management | 45.6 | 20.8 | 27.5 | 19.0 | −18.1 | −0.87 | 1,49 | 43.7 | 17.6 | 42.7 | 16.5 | −0.9 | −0.05 | 1,26 | −15.4 | −0.73 | 0.005 | 1,62 |
| Physical Tasks | 23.3 | 21.2 | 12.4 | 15.4 | −10.9 | −0.51 | 1,49 | 18.3 | 22.1 | 16.2 | 17.6 | −2.0 | −0.09 | 1,26 | −11.7 | −0.54 | 0.027 | 1,64 |
| Mental-Interpersonal Tasks | 37.3 | 15.8 | 25.5 | 17.0 | −11.8 | −0.75 | 1,50 | 38.5 | 14.6 | 36.8 | 16.4 | −1.6 | −0.11 | 1,26 | −9.5 | −0.59 | 0.017 | 1,64 |
| Output Tasks | 40.7 | 23.2 | 26.5 | 23.5 | −14.2 | −0.61 | 1,51 | 39.1 | 22.8 | 40.1 | 22.1 | 1.0 | 0.04 | 1,26 | −13.9 | −0.70 | 0.006 | 1,64 |
| % At-Work Productivity Loss | 10.3 | 4.3 | 6.8 | 4.3 | −3.5 | −0.81 | 1,48 | 10.1 | 3.8 | 9.8 | 4.0 | −0.3 | −0.08 | 1,26 | −2.9 | −0.78 | 0.002 | 1,61 |
| Absences | ||||||||||||||||||
| Days Missed Per Two Weeks | 1.7 | 1.7 | 1.0 | 1.2 | −0.8 | −0.47 | 1,50 | 1.1 | 1.4 | 2.2 | 2.6 | 1.1 | 0.79 | 1,26 | −1.7 | −0.87 | 0.001 | 1,65 |
| % Productivity Loss due to Absence | 16.6 | 14.6 | 9.5 | 12.1 | −7.1 | −0.49 | 1,50 | 11.9 | 14.2 | 20.9 | 23.8 | 9.0 | 0.63 | 1,26 | −15.0 | −0.90 | 0.001 | 1,61 |
| PHQ-9 Symptom Severity | 13.1 | 5.1 | 7.7 | 5.8 | −5.4 | −1.06 | 1,51 | 12.2 | 5.6 | 12.8 | 6.4 | 0.6 | 0.11 | 1,26 | −6.8 | −1.09 | 0.001 | 1,66 |
DF = degrees of freedom
Statistically significant change scores and change differences at the P≤.05 level are indicated in bold
The effect sizes for the difference between the change scores were calculated by dividing the change difference by the pooled standard deviations of the change scores for both the Usual Care and the treatment group change.
The difference between change scores between groups were adjusted by baseline score, age, gender and types of occupation (white collar vs. blue collar)