Table 2. T Penalized smoothly clipped absolute deviation regression analysis for the evaluation of IBS associated risk factors.* .
| Variables | Sub group | Coefficient | OR | 95% CI |
| Back/joint pain | No | - | 1 | - |
| Yes | 0.69 | 1.99 | 1.65-2.40 | |
| Insomnia | No | - | 1 | - |
| Yes | 0.50 | 1.65 | 1.40-1.93 | |
| Depression | No | - | 1 | - |
| Yes | 0.50 | 1.64 | 1.38-1.95 | |
| Sex | Male | - | 1 | - |
| Female | 0.46 | 1.58 | 1.27-1.96 | |
| Education | Illiterate | - | 1 | - |
| <5 | -0.17 | 0.84 | 0.67-1.05 | |
| 6-8 | -0.38 | 0.68 | 0.45-1.03 | |
| 9-12 | -0.38 | 0.68 | 0.43-1.07 | |
| >12 | -0.42 | 0.66 | 0.31-1.37 | |
| Anxiety | No | - | 1 | - |
| Yes | 0.36 | 1.43 | 1.21-1.69 | |
| History of chronic Disease | 1 | - | 1 | - |
| 2 | -0.35 | 0.71 | 0.47-1.04 | |
| 3 | -0.27 | 0.76 | 0.51-1.13 | |
| >3 | 0.00 | 1.00 | 0.67-1.47 | |
| Dentures | No denture | - | 1 | - |
| Lower or upper set | 0.29 | 1.33 | 0.95-1.87 | |
| Lower and upper set | 0.00 | 1.00 | 0.79-1.25 | |
| Liver disease | No | - | 1 | - |
| Yes | 0.26 | 1.30 | 0.87-1.92 | |
| Ethnicity | Fars | - | 1 | - |
| Tork | 0.12 | 1.12 | 0.96-1.31 | |
| Other | 0.26 | 1.30 | 0.92-1.82 | |
| Marital status | Single | - | 1 | - |
| Married | 0.21 | 1.23 | 1.03-1.48 | |
| History of opiate use | No | - | 1 | - |
| Yes | 0.10 | 1.11 | 0.80-1.52 | |
| History of tobacco use | No | - | 1 | - |
| Yes | -0.03 | 0.97 | 0.85-1.10 | |
| Physical Activity | 0.03 | 1.03 | 1.00-1.05 | |
| Body mass index | -0.02 | 0.98 | 0.96-0.99 | |
| Family household | 0.01 | 1.01 | 0.97-1.04 |
SE: Standard error, OR: odds ratio, IBS: irritable bowel syndrome
*Those with an odds ratio of 1 were considered base for comparison