TABLE 2.
Health Resource Utilization
| IC (n = 24,836) | Non-IC (n = 99,344) | Adjusted Ratio or Differencea | |
|---|---|---|---|
| Mean Number (SD) | Mean Number (SD) | Estimate (95% CI) | |
| Inpatient admissions | 0.15 (0.52) | 0.09 (0.36) | IRR: 1.54b (1.46-1.61) |
| Outpatient visits | 22.5 (20.0) | 11.0 (13.6) | IRR: 2.01b (1.98-2.03) |
| ED visits | 0.45 (1.49) | 0.19 (0.69) | IRR: 2.25b (2.15-2.35) |
| Prescription days supply | 1,079 (1,071) | 657 (857) | RD: 367b (356-377) |
| HL (n = 292) | Non-HL (n = 24,544) | Adjusted Ratio or Differencea | |
| Mean Number (SD) | Mean Number (SD) | Estimate (95% CI) | |
| Inpatient admissions | 0.25 (0.56) | 0.15 (0.52) | IRR: 1.57b (1.20-2.05) |
| Outpatient visits | 28.3 (20.0) | 22.4 (20.0) | IRR: 1.27b (1.17-1.38) |
| ED visits | 0.60 (1.19) | 0.45 (1.49) | IRR: 1.32c (1.04-1.67) |
| Prescription days supply | 1,238 (1,133) | 1,077 (1,070) | RD: 109 (-3-220) |
aAdjusted for baseline age, gender, region, insurance type, plan type, and Charlson Comorbidity Index.
bP value ≤ 0.001.
cP value ≤ 0.05.
CI = confidence interval; ED = emergency department; HL = Hunner’s lesions;
IC = interstitial cystitis; IRR = incidence rate ratio; RD = risk difference;
SD = standard deviation.