General characteristics of population (SD) arranged according to different age groups
|
Group A GA <28 weeks |
Group B GA ⩾28, ⩽32 weeks |
Group C GA >32, <37 weeks | p Values |
Differences between groups | |
| No | 32 | 64 | 34 | ||
| Mean gestational age (weeks) | 26.9 (0.8) | 29.9 (1.0) | 34.4 (1.2) | <0.00 | A-B-C |
| Mean birth weight (g) | 936 (144) | 1305 (298) | 2089 (438) | <0.00 | A-B-C |
| Artificial ventilation (days) | 18.6 (12.7) | 7.1 (9.4) | 0.2 (0.8) | <0.00 | A-B-C |
| Supplemental O2 (days) | 45.8 (35.8) | 37.9 (85.2) | 0.3 (0.8) | <0.00 | (A=B)-C |
| Mean maximum O2administration (%) | 67.4 (28.2) | 66.2 (32.3) | 22.2 (3.0) | <0.00 | (A=B)-C |
| Mean duration of hospitalisation (days) | 71.1(37.8) | 54.2 (60.1) | 22.3 (9.4) | <0.00 | (A=B)-C |
| BPD (N (%)) | 16 (50%) | 19 (29.7%) | 0 | <0.1 | (A=B)-C |
| PDA (N (%)) | 14 (43.8%) | 13 (20.3%) | 0 | <0.02 | A-B-C |
| ROP (N (%)) | 21 (65.6%) | 12 (18.7%) | 0 | <0.00 | A-B-C |
Continuous variables were tested by ANOVA on class differences and p values are listed in column 5. A Tukey post hoc procedure was performed to determine which age groups are really different from each other. A χ2 test was performed on discrete variables Bronchopulmonary dysplasia (BPD), persistent ductus arteriosus (PDA), retinopathy of prematurity (ROP) of groups A and B.