Table 3.
Perceived effect of smoking on inflammatory bowel diseases based on type of diagnosis
| Questionnaire items | Crohn’s disease | Ulcerative colitis | P value1 |
| Perceived impact of cigarette smoking on disease activity | |||
| Significantly worsened | 12/279 (4.3) | 2/191 (1.0) | < 0.001 |
| Moderately worsened | 209/279 (74.9) | 63/191 (33.0) | |
| No impact | 27/279 (9.7) | 12/191 (6.3) | |
| Moderately improved | 25/279 (9.0) | 58/191 (30.4) | |
| Significantly improved | 6/279 (2.2) | 56/191 (29.3) | |
| Perceived impact of using alternative smoking products on disease activity | |||
| Significantly worsened | 4/211 (1.9) | 12/187 (6.4) | 0.004 |
| Moderately worsened | 31/211 (14.7) | 14/187 (7.5) | |
| No impact | 146/211 (69.2) | 118/187 (63.1) | |
| Moderately improved | 23/211 (10.9) | 28/187 (15.0) | |
| Significantly improved | 7/211 (3.3) | 15/187 (8.0) | |
The survey had a hierarchical structure, meaning that only patients who answered to certain items could answer to other following questions. For this reason, the denominator for several questions is different. In some cases, the patient did not answer and this can result in a missing value. We have transparently declared in our tables the denominator we have used to calculate the proportion of patients giving certain answers.
1
Fisher’s exact test.