Table 4. Comparison of HRU between IBS-C patients and IBS patients without constipation.
| Unadjusted IRRsa (95% CIs) | Adjusted IRRsa (95% CIs) | |
|---|---|---|
| Medical Procedures and Diagnostic Tests | ||
| Colonoscopy | 1.43 (1.41–1.45) | 1.42 (1.40–1.44) |
| CT scan | 1.80 (1.75–1.84) | 1.63 (1.59–1.67) |
| Ultrasound | 1.50 (1.47–1.53) | 1.35 (1.32–1.38) |
| Anorectal Function Testing | 3.67 (3.41–3.96) | 4.14 (3.84–4.46) |
| Pharmacy prescriptions for treating constipation or diarrhea | 3.27 (3.17–3.38) | 3.42 (3.31–3.53) |
| Medical Visits | ||
| Intestinal-Related IP Admissions | 2.19 (2.10–2.28) | 1.91 (1.84–1.99) |
| Intestinal-Related ER Visits | 3.55 (3.42–3.69) | 3.19 (3.08–3.32) |
| GI Specialist Visits | 1.61 (1.58–1.64) | 1.55 (1.52–1.57) |
Note:
a An IRR > 1 indicates that IBS-C patients had higher HRU compared to IBS patients without constipation; while an IRR < 1 indicates that IBS-C patients had lower HRU compared to IBS patients without constipation. All p<0.001.
Abbreviations: CIs: confidence intervals. CT: computed tomography; ER: emergency room; GI: gastrointestinal; HRU, healthcare resource utilization; IBS, irritable bowel syndrome; IBS-C, irritable bowel syndrome with constipation; IP: inpatient; IRR: incidence rate ratio.