Table 4 Uni- and multivariable Poisson regression analysis of death risks of the whole Huai’an region
From: Correction to: A birth population-based survey of preterm morbidity and mortality by gestational age
A. The total preterm births | ||||
Variables | Category | All-death n (%) | Univariable RR (95% CI) | Multivariable RR (95% CI) |
Born in HWCH | No | 138 (9.1) | ||
Yes | 114 (10.0) | 1.10 (0.87–1.39) | 0.65 (0.52–0.82)3 | |
PROM | No | 192 (10.5) | ||
Yes | 60 (7.3) | 0.69 (0.53–0.92)1 | 1.09 (0.88–1.35) | |
HDP | No | 215 (9.7) | ||
Yes | 37 (8.5) | 0.88 (0.63–1.22) | 1.13 (0.86–1.48) | |
GDM | No | 239 (9.5) | ||
Yes | 13 (10.6) | 1.12 (0.66–1.90) | 1.39 (0.92–2.12) | |
Anemia | No | 228 (10.0) | ||
Yes | 24 (6.4) | 0.64 (0.43–0.96)1 | 0.84 (0.63–1.12) | |
ANG | No | 182 (11.8) | ||
Yes | 70 (6.3) | 0.54 (0.41–0.70)3 | 0.49 (0.27–0.74)1 | |
Cesarean delivery | No | 186 (16.7) | ||
Yes | 66 (4.3) | 0.26 (0.20–0.34)3 | 0.73 (0.56–0.96)1 | |
Male | No | 110 (9.7) | ||
Yes | 140 (9.2) | 0.95 (0.75–1.21) | 0.96 (0.81–1.15) | |
GA, weeks | 34–36 | 63 (3.5) | ||
32–33 | 35 (8.2) | 2.37 (1.59–3.53)3 | 1.15 (0.74–1.77) | |
28–31 | 93 (29.6) | 8.58 (6.38–11.5)3 | 1.66 (1.10–2.51)1 | |
25–27 | 61 (71.8) | 20.8 (15.8–27.4)3 | 1.67 (1.02–2.72)1 | |
BW, g | > 2500 | 43 (3.3) | ||
1500-2499 | 81 (7.5) | 2.25 (1.57–3.23)3 | 0.96 (0.65–1.41) | |
1000-1499 | 63 (31.0) | 9.35 (6.54–13.4)3 | 1.23 (0.77–1.95) | |
< 1000 | 65 (94.2) | 28.4 (21.0–38.3)3 | 2.25 (1.38–3.67)2 | |
Multiple births | No | 205 (10.0) | ||
Yes | 47 (7.8) | 0.78 (0.57–1.05) | 0.98 (0.78–1.25) | |
SGA | No | 199 (7.9) | ||
Yes | 24 (20.5) | 2.58 (1.76–3.78)3 | 1.09 (0.79–1.51) | |
AF contamination | No | 191 (7.8) | ||
Yes | 61 (30.5) | 3.91 (3.05–5.02)3 | 1.46 (1.16–1.84)2 | |
5-min Apgar < 7 | No | 49 (2.1) | ||
Yes | 203 (61.3) | 29.0 (21.7–38.8)3 | 14.7 (9.63–22.5)3 | |
Birth defects | No | 219 (8.5) | ||
Yes | 33 (40.7) | 4.78 (3.57–6.40)3 | 1.73 (1.28–2.33)3 | |
B. The hospitalized preterm infants | ||||
Variables | Category | In-hospital deaths n (%) | Univariable RR (95% CI) | Multivariable RR (95% CI) |
Admitted in HWCH | No | 31 (3.4) | ||
Inborn | 33 (4.1) | 1.22 (0.75–1.97) | 0.96 (0.58–1.58) | |
Out-born | 23 (10.3) | 3.05 (1.81–5.12)3 | 2.27 (1.40–3.69)2 | |
Male | No | 48 (5.7) | ||
Yes | 39 (3.6) | 0.63 (0.42–0.95)1 | 0.73 (0.50–1.07) | |
GA, weeks | 34–36 | 15 (1.2) | ||
32–33 | 12 (3.3) | 2.90 (1.37–6.14)2 | 1.49 (0.68–3.26) | |
28–31 | 38 (15.8) | 13.7 (7.65–24.5)3 | 2.31 (1.02–5.26)1 | |
25–27 | 22 (55.0) | 47.7 (26.8–84.9)3 | 2.44 (0.90–6.61) | |
BW, g | > 2500 | 9 (1.1) | ||
1500-2499 | 23 (2.5) | 2.23 (1.04–4.78)1 | 0.95 (0.40–2.25) | |
1000-1499 | 41 (23.8) | 21.6 (10.7–43.5)3 | 2.25 (0.83–6.13) | |
< 1000 | 14 (70.0) | 63.3 (31.1–128)3 | 3.66 (1.16–11.6)1 | |
Cesarean delivery | No | 58 (7.5) | ||
Yes | 29 (2.5) | 0.33 (0.21–0.51)3 | 0.53 (0.34–0.83)2 | |
5-min Apgar < 7 | No | 47 (2.6) | ||
Yes | 40 (24.0) | 9.04 (6.12–13.4)3 | 2.73 (1.75–4.26)3 | |
Birth defects | No | 67 (3.7) | ||
Yes | 20 (13.0) | 3.46 (2.16–5.55)3 | 2.57 (1.59–4.16)3 | |
Admitted within 24 h (after birth) | No | 8 (2.1) | ||
Yes | 79 (5.0) | 2.35 (1.15–4.82)1 | 0.81 (0.39–1.69) | |
RDS | No | 29 (1.7) | ||
Yes | 58 (21.2) | 12.2 (7.97–18.7)3 | 2.76 (1.65–4.65)3 | |
Pneumonia/sepsis | No | 20 (1.7) | ||
Yes | 67 (8.6) | 5.02 (3.07–8.20)3 | 0.74 (0.43–1.28) | |
NEC | No | 72 (3.8) | ||
Yes | 15 (39.5) | 10.4 (6.62–16.4)3 | 1.76 (1.03–3.03)1 | |
Surfactant | No | 50 (2.9) | ||
Yes | 37 (17.1) | 5.88 (3.94–8.78)3 | 0.43 (0.28–0.66)3 | |
NIV/MV | No | 6 (0.5) | ||
Yes | 81 (10.5) | 20.4 (8.93–46.4)3 | 6.69 (2.07–21.7)2 | |