Table 1.
Demographics by antiarrhythmic medication of first exposure, n (%)
| Digoxin N=337 | Propranolol N=120 | P | |
|---|---|---|---|
| Birth weight (g) | 0.31 | ||
| <1000 | 30 (9%) | 10 (8%) | |
| 1000–1499 | 41 (12%) | 17 (14%) | |
| 1500–2499 | 94 (28%) | 23 (19%) | |
| 2500–3499 | 110 (33%) | 41 (34%) | |
| ≥3500 | 60 (18%) | 29 (24%) | |
| Gestational age (weeks) | 0.31 | ||
| ≤28 | 49 (15%) | 12 (10%) | |
| 29–36 | 179 (53%) | 62 (52%) | |
| >36 | 109 (32%) | 46 (38%) | |
| Male, | 213 (63%) | 76 (63%) | 0.98 |
| Race/ethnicity | 0.36 | ||
| White | 196 (57%) | 60 (61%) | |
| Black | 64 (19%) | 11 (11%) | |
| Hispanic | 71 (21%) | 24 (24%) | |
| Other | 13 (4%) | 4 (4%) | |
| Inborn | 250 (72%) | 71 (68%) | 0.36 |
| Small for gestational age | 25 (7%) | 3 (2%) | 0.05 |
| Age at initiation of therapy (days) | 0.25 | ||
| ≤7 | 165 (49%) | 49 (41%) | |
| 8–14 | 90 (27%) | 43 (36%) | |
| 15–28 | 46 (14%) | 14 (12%) | |
| >28 | 36 (11%) | 14 (12%) |