Demographic data for each group (mean (SD))
| Characteristic | Single dose group | Double dose group |
|---|---|---|
| *Subjects returned only if a parent determined that an eye became red and/or had discharge ⩾48 hours of age. | ||
| Birth weight (g) | 3117 (401) | 3153 (420) |
| Post-conceptional age (weeks) | 39.9 (0.8) | 39.9 (0.8) |
| Proportion male | 49.8% | 53.0% |
| Maternal prenatal care | 97.5% | 98.4% |
| Maternal vaginitis or cervicitis | 5.5% | 5.0% |
| Minutes after birth, first drop | 6.1 (2.9) | 6.1 (3.3) |
| Hours after birth, second drop | – | 25.5 (3.6) |
| Age at discharge (hours) | 25.1 (8.7) | 25.8 (6.4) |
| Age at return (days)* | 3.5 (2.3) | 3.4 (1.9) |
| Total | 402 | 317 |