Table 1. Characteristics of the study sample.
| Variables | n | Frequency or mean±sd | % or median |
|---|---|---|---|
| Female | 316 | 153 | 48.4 |
| Weight at birth (g) | 316 | 1149.1±341.2 | 1176 |
| Weight at discharge (g) | 313 | 2110.6±386.7 | 1982 |
| GA (weeks) | 316 | 29.0±2.3 | 29 |
| SGA | 316 | 54 | 17.1 |
| EUGR | 313 | 195 | 62.3 |
| Feeding at discharge | 316 | ||
| Human milk | 109 | 34.5 | |
| Mixed milk | 114 | 36.1 | |
| Formula milk | 93 | 29.4 | |
| Intraventricular haemorrhage or Periventricular leukomalacia | 316 | 19 | 6.0 |
| Retinopathy of prematurity | 315 | 5 | 1.6 |
| Mechanical ventilation | 316 | 80 | 25.3 |
| Chronic lung disease | 315 | 66 | 21.0 |
| Sepsis | 315 | 44 | 14.0 |
| Necrotizing enterocolitis | 316 | 12 | 3.8 |
| Socio-Economic Status | 312 | 26.88±9.8 | 28 |
| GQ at 24 months CA | 276 | 93.4±15.8 | 97 |
| mild delay | 54 | 19.6 | |
| moderate delay | 10 | 3.6 | |
| severe delay | 21 | 7.6 | |
| Weight at 24 months CA | 266 | 11563.4±1660.2 | 11607.5 |
| Underweight at 24 months CA | 266 | 87 | 32.7 |