TABLE 2.
Demographic and baseline characteristics of infants and parents
| nHMF (n = 76) | cHMF (n = 74) | |
| Infant characteristics | ||
| Sex | ||
| Boys | 38 (50) | 35 (47) |
| Delivery type | ||
| Vaginal | 24 (32) | 20 (27) |
| Twin | 18 (24) | 16 (22) |
| Birth weight, g | 1147 ± 258 | 1156 ± 289 |
| Birth weight by birth weight category | ||
| <1000 g | ||
| n (%) | 24 (32) | 26 (35) |
| Birth weight, g | 850.5 ± 118.9 | 847.3 ± 105.1 |
| ≥1000 g | ||
| Birth weight, g | 1283.6 ± 175.4 | 1323.9 ± 206.2 |
| Birth length, cm | 37.1 ± 2.7 | 37.1 ± 3.1 |
| Birth head circumference, cm | 26.5 ± 2.7 | 26.7 ± 2.5 |
| Gestational age at birth, weeks | 28.8 ± 2.1 | 28.7 ± 1.8 |
| Postnatal age at study time points, days* | ||
| FSI1 | 13 (11, 18) | 14 (10, 20) |
| Day 1 | 16 (13, 20) | 17 (13, 23) |
| Day 21 | 36 (33, 40) | 37 (33, 43) |
| Week 40 corrected age | 76 (66, 91) | 76 (67, 83) |
| Apgar score | ||
| 1 min | 5.8 ± 2.5 | 5.8 ± 2.3 |
| 5 min | 8.0 ± 1.8 | 7.7 ± 1.9 |
| Parent characteristics | ||
| Smoking status | ||
| Mother smoker during pregnancy | 6 (9) | 18 (29) |
| Father smoker | 3 (5) | 12 (21) |
| Mother drank alcohol during pregnancy | 0 (0) | 4 (6) |
| Mother's age, y | 31.1 ± 5.1 | 30.8 ± 5.5 |
| Mother's BMI before pregnancy, kg/m2* | 23.2 (20.6, 27.2) | 21.3 (19.7, 26.1) |
| Mother's weight gain during pregnancy, kg | 11.2 ± 6.8 | 9.2 ± 5.2 |
BMI = body mass index; cHMF = control human milk fortifier; FSI1 = fortification strength increase day 1; nHMF = new human milk fortifier . Data are presented as n (%) for categorical variables and mean ± SD for continuous variables except where noted.
*Data are presented as median (Q1, Q3).