Characteristics of very low birthweight infants at admission to intensive care unit in two time periods. (If not indicated otherwise, values are given as median (5th; 95th) percentiles)
| Group 1 (n=655) | Group 2 (n=323) | P value | |
|---|---|---|---|
| Date of birth | 1/1978 - 12/1987 | 1/1988 - 12/1991 | |
| Inborns n (%) | 220 (33.6) | 233 (72.1) | < 0.01 |
| Infants resuscitated by a neonatologist n (%) | 87 (13.3) | 202 (62.5) | < 0.01 |
| Boys n (%) | 333 (50.8) | 177 (54.8) | 0.24 |
| Birthweight (g) | 1160 (700; 1470) | 1130 (660; 1470) | 0.19 |
| Gestational age (weeks) | 29.8 (25.5; 35.0) | 29.1 (25.0; 34.2) | 0.02 |
| Apgar score at 1 minute | 5 (1; 9) | 4 (1; 8) | 0.10 |
| Apgar score at 5 minutes | 8 (3; 10) | 7 (4; 10) | 0.75 |
| pH | 7.31 (7.08; 7.50) | 7.33 (7.13; 7.52) | <0.01 |
| Base excess (mmol/l) | −5 (−14; −1) | −3 (−12; +3) | < 0.01 |
| PO2(torr) | 47 (25; 79) | 45 (19; 77) | 0.26 |
| PCO2(torr) | 44 (25; 72) | 43 (26; 66) | 0.58 |
| Blood glucose (mg/dl) | 90 (25; 175) | 70 (27; 160) | 0.05 |
| Rectal temperature (°C) | 36.0 (34.0; 37.5) | 37.0 (35.7; 38.4) | < 0.01 |
| Infants with RDS n (%) | 347 (53.0) | 124 (38.4) | < 0.01 |
| Ventilated infants n (%) | 438 (66.9) | 249 (77.1) | < 0.01 |
RDS=respiratory distress syndrome.