Table 1. The comparisons of RSVH rates among each GA groups and BPD status of preterm infants in the first 2 years of age.
| Gestational age | <29 wGA | 29–32 wGA | 33–35 wGA | |||
|---|---|---|---|---|---|---|
| 1st Year | 2nd Year | 1st Year | 2nd Year | 1st Year | 2nd Year | |
| Overall, % (n/N) | 5.7 (56/980) | 3.6 (34/942) | 3.8 (115/3,009) | 1.7 (50/2,957) | 2.2 (229/11,542) | 0.7 (85/11,487) |
| No BPD, % (n/N) | 5.0 (38/767) | 3.5 (26/736) | 3.6 (104/2,891) | 1.2 (35/2,845) | 1.9 (215/11,477) | 0.7 (80/11,431) |
| OR (95% CI) vs Term | 5.7 (4.1–7.9)* | 9.7 (6.5–14.3)* | 4.1 (3.4–5.0)* | 3.3 (2.3–4.6)* | 2.1 (1.8–2.4)* | 1.9 (1.5–2.3)* |
| OR (95% CI) vs 33–35 wGA | 2.7 (1.9–3.9)* | 5.2 (3.3–8.1)* | 2.0 (1.5–2.5)* | 1.8 (1.2–2.6)‡ | – | – |
| OR (95% CI) vs 29–32 wGA | 1.4 (0.9–2.0) | 2.9 (1.8–4.9)* | – | – | – | – |
| BPD, % (n/N) | 8.5 (18/213) | 3.9 (8/206) | 9.3 (11/118) | 5.4 (6/112) | 21.5 (14/65) | 8.9 (5/56) |
| OR (95% CI) vs no BPD | 1.8 (0.9–3.7) | 1.1 (0.5–2.5) | 2.8 (1.5–5.2)‡ | 4.5 (2.0–10.2)‡ | 14.4 (9.1–22.8)* | 13.9 (6.8–28.7)* |
BPD, bronchopulmonary dysplasia; n, number of RSVH by each GA group; N, number of preterm infants; OR, odds ratio; 95% CI, 95% confidence intervals; wGA: weeks of gestational age
†p<0.05
‡p<0.01
§p<0.001, and
*p<0.0001 indicate comparisons between each other in category of GA and BPD.