| BPD, N = 292 (%) | Control, N = 1168 (%) | P values |
---|---|---|---|
Sex | Â | Â | 0.999 |
 Male | 102 (34.9) | 408 (34.9) |  |
 Female | 190 (65.1) | 760 (65.1) |  |
 Age (years)a | 25 (21–33) | 25 (21–33) | 0.999 |
Distribution of age | Â | Â | 0.999 |
 0–19 | 37 (12.7) | 148 (12.7) |  |
 20–39 | 226 (77.4) | 904 (77.4) |  |
 40–59 | 29 (9.9) | 116 (9.9) |  |