Table 4.
Within and between group parameter estimates for the primary and secondary outcomes at post intervention and 3 month follow-up
| POST INTERVENTION | 3 MONTH FOLLOW-UP | |||||
|---|---|---|---|---|---|---|
| Measures | Estimate(SE) | 95% CI | p | Estimate(SE) | 95% CI | p |
| 1. GI Symptom Severity | ||||||
| Control | 10.90 (.67) | 9.58, 12.23 | 10.20 (.67) | 8.87, 11.52 | ||
| Class | 7.82 (.67) | 6.50, 9.15 | 6.83 (.68) | 5.49, 8.17 | ||
| Difference | 3.08 (.96) | 1.17, 4.99 | .002 | 3.37 (.97) | 1.44, 5.29 | .001 |
| 2. QoL | ||||||
| Control | 66.42 (2.05) | 62.34, 70.50 | 70.22 (2.08) | 66.09, 74.35 | ||
| Class | 75.62 (2.03) | 71.59, 79.65 | 77.64 (2.00) | 73.65, 81.62 | ||
| Difference | −9.20 (2.89) | −14.95, −3.45 | .002 | −7.42 (2.30) | −13.17, −1.66 | .012 |
| 3. Depression | ||||||
| Control | 6.49 (.48) | 5.55, 7.43 | 5.54 (.46) | 4.62, 6.46 | ||
| Class | 4.61 (.46) | 3.70, 5.52 | 4.19 (.46) | 3.28, 5.11 | ||
| Difference | 1.88 (.66) | .57, 3.19 | .005 | 1.34 (.66) | .04, 2.64 | .043 |
| 4. Anxiety | ||||||
| Control | 9.24 (.55) | 8.16, 10.33 | 8.63 (.54) | 7.57, 9.69 | ||
| Class | 8.00 (.52) | 6.96, 9.05 | 7.82 (.53) | 6.76, 8.87 | ||
| Difference | 1.24 (.77) | −.28, 2.77 | .109 | .81 (.76) | −.70, 2.32 | .290 |
| 5. VSI | ||||||
| Control | 42.31 (1.71) | 38.91, 45.70 | 37.43 (1.69) | 34.08, 40.78 | ||
| Class | 34.04 (1.66) | 30.74, 37.34 | 32.71 (1.77) | 29.19, 36.22 | ||
| Difference | 8.26 (2.39) | 3.52, 13.01 | .001 | 4.72 (2.46) | −.15, 9.59 | .058 |
| 6. Coping Skills: Catastrophizing | ||||||
| Control | 11.63 (.82) | 10.00, 13.27 | 8.89 (.82) | 7.25, 10.52 | ||
| Class | 7.40 (.84) | 5.75, 9.06 | 5.88 (.84) | 4.22, 7.53 | ||
| Difference | 4.23 (1.18) | 1.89, 6.56 | .001 | 3.01 (1.18) | .68, 5.35 | .012 |
| 7. Coping Skills: Control | ||||||
| Control | 2.57 (.21) | 2.16, 2.97 | 2.54 (.21) | 2.13, 2.94 | ||
| Class | 3.20 (.20) | 2.80, 3.60 | 3.23 (.21) | 2.83, 3.64 | ||
| Difference | −.64 (.29) | −1.21, −.07 | .029 | −.70 (.29) | −1.27, −.012 | .019 |
| 8. Coping Skills: Symptom Change | ||||||
| Control | 2.06 (.20) | 1.67, 2.46 | 2.21 (.20) | 1.81, 2.61 | ||
| Class | 2.96 (0.20) | 2.56, 3.35 | 2.63 (.20) | 2.23, 3.03 | ||
| Difference | −.89 (.28) | −1.45, −.33 | .002 | −.42 (.29) | −.99, .15 | .143 |
Bootstrapped estimates and standard errors
CI: Confidence Intervals
Measures: 1. GI symptom severity; 2. IBS-QoL: IBS Quality of Life Measure(37, 38); 3. Depression using the HAD: Hospital Anxiety and Depression(39,40); 4. Depression using the HAD: Hospital Anxiety and Depression(39,40); 5. VSI: Visceral Sensitivity Index(36); 6. Coping Skills Catastrophizing(41); 7. Coping Skills Control(41); 8. Coping Skills Symptom Change)(41)