Characteristics of study participants
| Premature subjects | |||
|---|---|---|---|
| Control subjects | Low risk | High risk | |
| Values represent actual numbers (sex, caesarean section, infertility treatment, single mother), ranges (PERI), or means for all other variables (standard deviations in parentheses). | |||
| PERI, Perinatal risk inventory; NICU, stay on neonatal intensive care unit. | |||
| Number | 25 | 23 | 27 |
| Male/female | 10/15 | 13/10 | 15/12 |
| Socioeconomic status | 2.84 (0.63) | 2.63 (0.52) | 2.07 (0.57) |
| Mothers’ age (years) | 32.0 (4.3) | 30.9 (4.3) | 31.3 (5.0) |
| PERI (range) | 0–2 | 1–4 | 5–15 |
| Caesarean section | 5/25 (20%) | 17/23 (74%) | 24/27 (89%) |
| Gestational age (weeks) | 39.9 (1.1) | 31.3 (1.5) | 29.3 (2.0) |
| Birth weight (g) | 3296 (485) | 1615 (280) | 1131 (318) |
| NICU (days) | 0.0 (0.0) | 40.7 (14.8) | 67.3 (23.7) |
| Respiratory assistance (days) | 0.0 (0.0) | 5.9 (8.8) | 18.0 (18.8) |
| Developmental quotient | 118.3 (5.7) | 121.2 (5.6) | 115.9 (7.5) |
| Parity | 0.76 (0.83) | 0.45 (0.59) | 0.81 (1.24) |
| Gestity | 2.28 (1.37) | 2.26 (1.35) | 2.70 (1.93) |
| Infertility treatment | 0/25 (0%) | 3/23 (13%) | 2/27 (7%) |
| Single mother | 0/25 (0%) | 0/23 (0%) | 1/27 (4%) |