Outcome by GA at Birth (weeks)
|
1973–1978
|
1995–2010
|
---|
Male infants
|
Female infants
|
Male infants
|
Female infants
|
---|
Rate/1000
|
OR (95 % CI)
|
Rate/1000
|
OR (95 % CI)
|
Rate/1000
|
OR (95 % CI)
|
Rate/1000
|
OR (95 % CI)
|
---|
Neonatal death
|
35–36
|
20.7
|
10.9 (8.97–13.1)
|
18.1
|
11.0 (8.81–13.8)
|
4.9
|
9.45 (7.39–12.1)
|
5.2
|
11.0 (8.48–14.2)
|
37–38
|
5.6
|
2.88 (2.42–3.44)
|
4.4
|
2.62 (2.13–3.24)
|
1.3
|
2.49 (2.01–3.09)
|
1.0
|
2.01 (1.58–2.55)
|
39–40
|
1.9
|
1.00 (ref)
|
1.7
|
1.00 (ref)
|
0.5
|
1.00 (ref)
|
0.5
|
1.00 (ref)
|
Apgar score <7 at 5 min
|
35–36
|
40.7
|
4.61 (4.08–5.21)
|
37.9
|
5.25 (4.55–6.06)
|
24.8
|
2.99 (2.71–3.29)
|
19.8
|
3.02 (2.69–3.38)
|
37–38
|
14.4
|
1.63 (1.48–1.80)
|
13.5
|
1.88 (1.68–2.11)
|
9.0
|
1.13 (1.06–1.22)
|
6.7
|
1.08 (0.99–1.17)
|
39–40
|
8.8
|
1.00 (ref)
|
7.2
|
1.00 (ref)
|
7.9
|
1.00 (ref)
|
6.2
|
1.00 (ref)
|
Pneumothorax
|
35–36
|
7.6
|
8.87 (6.53–12.0)
|
4.5
|
7.82 (5.10–12.0)
|
6.7
|
3.92 (3.25–4.73)
|
3.0
|
2.99 (2.24–3.99)
|
37–38
|
2.0
|
2.32 (1.74–3.08)
|
1.4
|
2.41 (1.66–3.50)
|
2.3
|
1.41 (1.22–1.63)
|
0.8
|
0.83 (0.66–1.04)
|
39–40
|
0.8
|
1.00 (ref)
|
0.5
|
1.00 (ref)
|
1.6
|
1.00 (ref)
|
0.9
|
1.00 (ref)
|
RDSb
|
35–36
|
30.6
|
33.1 (26.8–41.0)
|
17.8
|
35.6 (26.3–48.2)
|
16.2
|
82.6 (63.6–107)
|
8.6
|
63.6 (45.9–88.3)
|
37–38
|
3.7
|
3.91 (3.09–4.95)
|
2.6
|
5.09 (3.69–7.01)
|
1.3
|
6.33 (4.76–8.42)
|
0.5
|
3.22 (2.18–4.75)
|
39–40
|
0.9
|
1.00 (ref)
|
0.5
|
1.00 (ref)
|
0.2
|
1.00 (ref)
|
0.1
|
1.00 (ref)
|
Other respiratory conditions
|
35–36
|
49.2
|
6.44 (5.74–7.22)
|
38.0
|
7.18 (6.20–8.31)
|
100.0
|
7.07 (6.70–7.46)
|
65.3
|
6.50 (6.08–6.96)
|
37–38
|
18.9
|
2.42 (2.21–2.66)
|
12.0
|
2.22 (1.96–2.51)
|
27.6
|
1.87 (1.79–1.95)
|
15.4
|
1.51 (1.43–1.60)
|
39–40
|
7.8
|
1.00 (ref)
|
5.4
|
1.00 (ref)
|
14.9
|
1.00 (ref)
|
10.2
|
1.00 (ref)
|
Hyperbilirubinemia
|
35–36
|
238.5
|
5.88 (5.56–6.21)
|
219.5
|
7.62 (7.14–8.13)
|
292.7
|
16.5 (15.9–17.1)
|
261.2
|
18.8 (18.0–19.6)
|
37–38
|
113.4
|
2.41 (2.32–2.51)
|
98.5
|
2.97 (2.84–3.11)
|
53.0
|
2.33 (2.25–2.41)
|
40.9
|
2.39 (2.30–2.48)
|
39–40
|
50.0
|
1.00 (ref)
|
35.2
|
1.00 (ref)
|
23.5
|
1.00 (ref)
|
17.6
|
1.00 (ref)
|
- a Adjusted for maternal age, parity, and level of hospital care
- b Respiratory distress syndrome of the newborn