Table 1. Demographic characteristics of study population including the derivation and validation data set (N=461).
| Parameters | Study population (n=461) | Derivation data set (n=227) | Validation data set (n=234) | Validation vs. derivation, P |
|---|---|---|---|---|
| Birth weight, mean (SD), g | 3,157.3±516.7 | 3,148.5±481.8 | 3,165.9±549.3 | 0.719 |
| Age at admission, mean (SD), day | 47.6±20.7 | 45.2±18.4 | 49.9±22.5 | 0.012 |
| Weight at admission mean (SD), g | 4,444.1±1,082.7 | 4,242.9±998.0 | 4,640.9±1,127.3 | <0.001 |
| Gestational age | ||||
| Preterm, No. (%) | 47 (10.2) | 21 (9.3) | 26 (11.1) | 0.509 |
| Term, No. (%) | 414 (89.8) | 206 (90.7) | 208 (88.9) | |
| Sex | ||||
| Male, No. (%) | 269 (58.4) | 137 (60.4) | 132 (56.4) | 0.391 |
| Female, No. (%) | 192 (41.6) | 90 (39.6) | 102 (43.6) | |
SD, standard deviation.