Table 1 Sample characteristics (clinical and socio-demographic variables)
Mean | Mean | p value | |
|---|---|---|---|
(SD) | (SD) | ||
95 % CI | 95 % CI | ||
Total enrolled infants | VLBW | FTI | χ 2 = 0.0275; n.s. |
Gender | n = 150 | n = 145 | |
Female (%) | 52.0 | 51.0 | |
Male (%) | 48.0 | 48.9 | |
Birth weight (grams) | 1,132 | 3,297 | t = 59.86; p < 0.0005 |
(232.6) | (374.4) | ||
1,094−1,169 | 3,236−3,357 | ||
Gestational age at birth (weeks) | 29.1 | 38.3 | t = 49.13; p < 0.0005 |
(2.2) | (1.1) | ||
28.7−29.5 | 38.1−38.5 | ||
NICU length of stay (days) | 59.7 | 0 | t = 31.55; p < 0.0005 |
(21.6) | 0 | ||
56.2−63.2 | |||
Mother: | |||
Socio-economic status (%) | n = 148 | n = 143 | |
Education (years) | 12.5 | 12.7 | t = −0.14; n.s. |
(3.8) | (3.7) | ||
11.9−13.1 | 12.1−13.3 | ||
Father: | |||
Socio-economic status (%) | n = 146 | n = 142 | |
Education (years) | 12.5 | 11.5 | t = −0.83; n.s. |
(4.0) | (3.4) | ||
11.9−13.1 | 10.9−12.1 | ||
Parents’ socio-economic status score | n = 123 | n = 116 | |
51.6 | 54.8 | t = −0.48; n.s. | |
(19.9) | (20.5) | ||
48.1−55.1 | 51.1−58.5 |