Table 5.
Summary of hierarchical logistical regression analysis predicting the presence of irritable bowel syndrome (IBS) (95% BCa bootstrap confidence intervals based on 5,000 samples).
| b | p | 95% Confidence Interval | 95% Confidence Interval for Odds Ratio | ||||
|---|---|---|---|---|---|---|---|
| Lower | Upper | Lower | Odds | Upper | |||
| Step 1 | |||||||
| Constant | −4.35 | .003** | −11.08 | −1.80 | |||
| Anxiety | 0.053 | .226 | −0.03 | 0.23 | 0.96 | 1.05 | 1.16 |
| Depression | 0.18 | .005** | 0.07 | 0.42 | 1.05 | 1.20 | 1.36 |
| Step 2 | |||||||
| Constant | −4.44 | .006** | −14.70 | −0.97 | |||
| Anxiety | 0.06 | .223 | −0.03 | 0.36 | 0.96 | 1.06 | 1.16 |
| Depression | 0.19 | .003** | 0.07 | 0.61 | 1.05 | 1.20 | 1.37 |
| HFnu | −0.01 | .713 | −0.12 | 0.06 | 0.95 | 0.99 | 1.04 |
| Cortisol | 0.001 | .778 | −0.01 | 0.01 | 1 | 1 | 1.01 |
| Step 3 | |||||||
| Constant | −4.74 | .055t | −291.88 | 6.43 | |||
| Anxiety | 0.06 | .260 | −.09 | 7.20 | 0.96 | 1.06 | 1.17 |
| Depression | 0.18 | .014* | .04 | 29.74 | 1.02 | 1.19 | 1.4 |
| HFnu | −0.01 | .726 | −3.82 | .12 | 0.95 | 0.99 | 1.04 |
| Cortisol | 0.001 | .737 | −.23 | .02 | 1 | 1 | 1.01 |
| DIF | 0.02 | .858 | −5.35 | 3.23 | 0.79 | 1.02 | 1.31 |
| DDF | 0.01 | .897 | −18.69 | 2.01 | 0.75 | 1.01 | 1.36 |
**≤.01; *≤.05; t ≤.07. HFnu, High Frequency Normalized unit; DIF, Difficulty identifying feelings; DDF, Difficulty describing feelings on the Toronto Alexithymia Scale.