Table 2.
Univariate and multivariate logistic regression analysis of the association between anal fistula and anorectal abscess incidence and body mass index.
| Anal fistula | Anorectal abscesses | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Model | BMI grouping | OR | z | P | 95% CI | OR | z | P | 95% CI |
| Model 1 | Overly thin | 0.75 | −0.57 | 0.569 | 0.29–1.99 | 0.93 | −0.13 | 0.894 | 0.32–2.72 |
| Normal | Ref. | Ref. | |||||||
| Overweight | 1.36 | 2.00 | 0.046 | 1.01–1.83 | 1.41 | 1.97 | 0.049 | 1.00–2.00 | |
| Obesity | 3.44 | 5.73 | <0.001 | 2.26–5.26 | 2.24 | 3.20 | 0.001 | 1.37–3.67 | |
| Model 2 | Overly thin | 0.98 | −0.03 | 0.975 | 0.36–2.67 | 1.22 | 0.36 | 0.718 | 0.41–3.68 |
| Normal | Ref. | Ref. | |||||||
| Overweight | 1.16 | 0.94 | 0.349 | 0.85–1.57 | 1.22 | 1.10 | 0.271 | 0.86–1.74 | |
| Obesity | 3.16 | 5.22 | <0.001 | 2.05–4.87 | 2.04 | 2.78 | 0.005 | 1.23–3.36 | |
| Model 3 | Overly thin | 0.97 | −0.06 | 0.954 | 0.29–3.18 | 1.70 | 0.80 | 0.424 | 0.46–6.30 |
| Normal | Ref. | Ref. | |||||||
| Overweight | 0.96 | −0.18 | 0.854 | 0.64–1.44 | 1.32 | 1.10 | 0.271 | 0.81–2.14 | |
| Obesity | 2.43 | 3.08 | 0.002 | 1.38–4.29 | 2.96 | 3.20 | 0.001 | 1.52–5.76 | |
Model 2, adjusted for age and gender; Model 3, adjusted for age, gender, job, marital status, education, smoking, drinking, sedentary, spicy and greasy.