Table 1 Baseline demographics at index
Demographics | SCS use cohort N = 7473 | Non/burst-SCS use cohort N = 89,281 | Standardized difference (%) |
|---|---|---|---|
Observation period, months, mean (SD) [median] | 24.6 (14.9) [21] | 24.2 (15.1) [20] | 2.4 |
Age, years, mean (SD) [median] | 67.4 (13.6) [69] | 52.2 (20.6) [55] | 86.8* |
Female, n (%) | 4682 (63) | 59,249 (66) | 7.8 |
Region, n (%) | Â | Â | Â |
South | 3246 (43.4) | 37,373 (41.9) | 3.2 |
West | 1664 (22.3) | 21,869 (24.5) | 5.3 |
Midwest | 1514 (20.3) | 18,700 (20.9) | 1.7 |
Northeast | 1046 (14.0) | 11,225 (12.6) | 4.2 |
Unknown | 3 (0.0) | 114 (0.1) | 3.0 |
Insurance plan type, n (%) | Â | Â | Â |
Medicare | 5877 (78.6) | 37,283 (41.8) | 75.4* |
Commercial | 1596 (21.4) | 51,998 (58.2) | 75.4* |
Physician specialty†, n (%) |  |  |  |
Primary care | 3502 (46.9) | 52,432 (58.7) | 23.8* |
Respiratory specialist | 1314 (17.6) | 18,193 (20.4) | 7.1 |
Pulmonologist | 1070 (14.3) | 10,409 (11.7) | 7.9 |
Allergist | 247 (3.3) | 7839 (8.8) | 23.0* |