| Stratum 1 (Hb 110–130 g/L) |  | Stratum 2 (Hb > 130 g/L) | |
---|---|---|---|---|
 | Intervention (80 mg/d) (n = 161) | Control (40 mg/d) (n = 167) | Intervention (20 mg/d) (n = 82) | Control (40 mg/d) (n = 93) |
Age at assessment, days | 47 ± 15 | 47 ± 13 | 47 ± 14 | 47 ± 14 |
Sex, girl | 51.1 [81] | 51.6 [83] | 45.9 [37] | 45.5 [44] |
Gestational age, weeks | 39.62 (1.51) | 39.74 (1.38) | 39.61 (1.50) | 39.85 (1.30) |
Apgar test score ≥ 7 points, % | 98.8 [159] | 100 [167] | 100 [82] | 98.9 [92] |
Breastfeeding, yes | ||||
 At birth | 63.9 [98] | 68.3 [114] | 63.1 [50] | 63.6 [60] |
 At assessment | 54.4 [87] | 63.5 [106] | 51.2 [41] | 56.5 [52] |
Neurodevelopment | ||||
 Cognitive developmenta | 100.81 (8.86) | 101.79 (8.55) | 101.28 (9.16) | 103.28 (8.95) |
 Score < 85, % | 3.1 [5] | 2.4 [4] | 3.7 [3] | 1.1 [1] |
 Language developmenta | 96.44 (8.34) | 95.92 (8.61) | 95.04 (7.35) | 97.34 (8.23) |
 Score < 85, % | 8.0 [13] | 10.1 [17] | 8.5 [7] | 4.3 [4] |
 Expressive languageb | 8.04 (1.39) | 8.16 (1.65) | 7.88 (1.41) | 8.09 (1.78) |
 Score < 7, % | 9.3 [14] | 12.5 [20] | 11.0 [9] | 16.1 [15] |
 Receptive languageb | 10.71 (2.12) | 10.41 (2.17) | 10.43 (2.04) | 10.98 (2.04) |
 Score < 7, % | 4.3 [7] | 4.2 [7] | 2.4 [2] | 4.3 [4] |
 Motor developmenta | 107.27 (12.74) | 107.83 (10.27) | 107.16 (10.02) | 108.08 (11.35) |
 Score < 85, % | 3.1 [5] | 2.4 [4] | 2.4 [2] | 4.3 [4] |
 Fine motorb | 11.46 (1.98) | 11.53 (1.85) | 11.39 (1.92) | 11.43 (2.09) |
 Score < 7, % | 0.6 [1] | 0.6 [1] | 1.2 [1] | 2.2 [2] |
 Gross motorb | 11.12 (2.34) | 11.00 (2.26) | 11.01 (2.34) | 11.19 (2.46) |
 Score < 7, % | 0 [0] | 0.6 [1] | 0 [0] | 0 [0] |