Table 2.
Annualized healthcare utilization in the followup period for SLE patients and their matched controls.
| SLE patients | Non-SLE patients | Difference | P value | |||
|---|---|---|---|---|---|---|
| N = 14,262 | N = 14,262 | |||||
| Number of patients with at least 1 inpatient admission during the entire followup (N, %) | 8,459 | 59.3% | 5,644 | 39.6% | 20% | <0.001 |
| Among those with at least 1 IP admission, number of inpatient admissions (mean, SD) | 1.2 | 1.6 | 1.0 | 1.3 | 0.2 | <0.001 |
| Number of inpatient admissions among all patients (mean, SD) | 0.7 | 1.3 | 0.4 | 1.0 | 0.3 | <0.001 |
| Number of patients with at least 1 ER visit during the entire followup (N, %) | 11,202 | 78.5% | 9,494 | 67.5% | 11% | <0.001 |
| Among those with at least 1 ER visit, number of ER visits (mean, SD) | 2.6 | 4.7 | 2.1 | 3.5 | 0.6 | <0.001 |
| Number of ER visits among all patients (mean, SD) | 2.1 | 4.3 | 1.4 | 2.9 | 0.7 | <0.001 |
| Number of physician office visits (mean, SD) | 9.8 | 8.2 | 6.4 | 7.0 | 3.4 | <0.001 |
| Number of outpatient hospital visits (mean, SD) | 3.3 | 5.8 | 2.2 | 5.0 | 1.1 | <0.001 |
| Number of other outpatient services (mean, SD) | 69.7 | 86.8 | 56.8 | 89.8 | 12.9 | <0.001 |
N: number, IP: inpatient admission, ER: emergency room.