Table 2.
Association between 5-ASA adherence and all-cause health care utilization during 12-month period following 5-ASA initiation
| Dependant Variable | Incident Rate Ratioa | Confidence Interval | P Value | |
|---|---|---|---|---|
| Number of inpatient admissions |
0.6928 |
0.5461 |
0.8789 |
0.0025 |
| Number of ER visits |
0.6584 |
0.5077 |
0.8538 |
0.0016 |
| Number of outpatient office visits |
1.0004 |
0.9200 |
1.0878 |
0.9925 |
| Number of other outpatient/ ancillary visits |
0.9306 |
0.8587 |
1.0086 |
0.0798 |
| Number of pharmacy prescriptions |
1.2503 |
1.1624 |
1.3448 |
< .0001 |
| Number of UC-related pharmacy prescriptions |
1.7095 |
1.6258 |
1.7974 |
< .0001 |
| Number of non–UC-related pharmacy prescriptions |
0.9989 |
0.8862 |
1.1258 |
0.9852 |
| Number of non-pharmacy visits |
0.9605 |
0.8937 |
1.0322 |
0.2725 |
| Number of total visits | 1.1294 | 1.0595 | 1.2039 | 0.0002 |
5-ASA = 5-aminosalicylate; ER = emergency department; UC = ulcerative colitis.
aIncident rate ratios are based on Poisson regression models and show utilization among adherent patients compared to nonadherent patients. All models control for age, gender, geographic region, health plan type, payer type, and Charlson Comorbidity Index scores.