| Gestational
age group | PRE-1 | PRE-2 | PRE-3 | TERM | Total | | < 28 weeks | 28 – 31+6 weeks | 32 – 36+6 weeks | ≥ 37weeks |
| | Number | 25 | 139 | 195 | 146 | 505 | | Male | 14 (56.0) | 70 (50.4) | 109 (55.9) | 75 (51.4) | 268 (53.1) | | Gestational age (d) | 191 (187, 193) | 211 (204, 219) | 240 (232, 248) | 274 (266, 283) | 239 (218, 263) | | Birth weight (g) | 990 (933, 1115) | 1440 (1245, 1625) | 2000 (1800, 2290) | 3305 (2954, 3653) | 1980 (1533, 2830) | | Length (cm) | 35 (34, 36) | 38 (37, 40) | 42 (41, 44) | 49 (47, 50) | 42 (39, 46) | | Head circumference (cm) | 25.0 (24.0, 25.0) | 27.5 (26.0, 28.0) | 30.0 (29.0, 31.0) | 34.0 (33.0, 35.0) | 30.0 (28.0, 33.0) | | Alkaline phosphatase (IU/L) | 261 (207, 317) | 226 (173, 273) | 204 (168, 238) | 167 (139, 199) | 197 (160, 246) | | Calcium (mmol/L) | 1.81 (1.66, 1.93) | 1.98 (1.87, 2.12) | 2.10 (1.99, 2.22) | 2.17 (2.01, 2.29) | 2.07 (1.94, 2.21) | | Phosphorus (mmol/L) | 2.06 (1.91, 2.24) | 1.99 (1.78, 2.27) | 1.86 (1.67, 2.03) | 1.79 (1.62, 1.94) | 1.88 (1.67, 2.09) |
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