Adjusted† ORs for factors associated with anaemia among the screened mild to moderate inflammatory bowel disease (IBD) in MarketScan, 2010–2014
| Inflammatory bowel disease OR (95% CI) N=11 353 | Crohn's disease OR (95% CI) N=5104 | Ulcerative colitis OR (95% CI) N=6249 | |
|---|---|---|---|
| Crohn's disease vs ulcerative colitis | 1.1 (1.0 to 1.2)* | ||
| Female vs male | 1.5 (1.4 to 1.7)*** | 1.5 (1.3 to 1.7)*** | 1.5 (1.4 to 1.7)*** |
| Total number of IBD outpatient visits during follow-up | |||
| 2–5 visits | Reference | Reference | Reference |
| 6–10 visits | 1.4 (1.3 to 1.5)*** | 1.3 (1.1 to 1.6)** | 1.5 (1.3 to 1.7)*** |
| >10 visits | 2.4 (2.2 to 2.7)*** | 2.1 (1.8 to 2.4)*** | 2.8 (2.4 to 3.2)*** |
| Smoker vs non-smoker/unknown | 0.7 (0.6 to 0.9)** | 0.7 (0.6 to 0.9)** | 0.8 (0.6 to 1.0) |
| Age at first IBD encounter | |||
| 50–64 years | Reference | Reference | Reference |
| 18–34 years | 1.1 (1.0 to 1.3)* | 1.1 (0.9 to 1.2) | 1.2 (1.0 to 1.4)* |
| 35–49 years | 1.0 (0.9 to 1.1) | 1.0 (0.9 to 1.2) | 1.1 (0.9 to 1.2) |
*p<0.05, **p<0.01, ***p<0.0001.
†Adjusted for all factors in the table and length of study follow-up in years.