|
Gestational age/Birth weight
|
1995–2005
|
2005
|
|---|
|
Rate (95 % CI)
|
Rate Ratio (95 % CI)
|
Rate (95 % CI)
|
Rate Ratio (95 % CI)
|
|---|
|
GA (weeks)
|
≥22
|
Canada
|
4.8 (4.7–4.9)
|
1.27 (1.24–1.29)
|
5.0 (4.7–5.3)
|
1.55 (1.45–1.64)
|
|
USA
|
5.7 (5.7–5.8)
|
1.50 (1.49–1.51)
|
5.4 (5.4–5.5)
|
1.70 (1.68–1.72)
|
|
Denmarka
|
4.4 (4.2–4.5)
|
1.14 (1.10–1.18)
|
4.8 (4.3–5.4)
|
1.51 (1.35–1.69)
|
|
Finland
|
3.8 (3.7–4.0)
|
1.00
|
3.2 (2.8–3.7)
|
1.00
|
|
Iceland
|
4.3 (3.7–4.9)
|
1.12 (0.97–1.29)
|
4.9 (3.0–7.4)
|
1.52 (0.94–2.33)
|
|
Norway
|
5.0 (4.8–5.2)
|
1.31 (1.26–1.35)
|
3.7 (3.2–4.3)
|
1.17 (1.01–1.33)
|
|
Swedena
|
3.4 (3.3–3.6)
|
0.90 (0.87–0.93)
|
2.9 (2.6–3.3)
|
0.92 (0.81–1.03)
|
|
≥28
|
Canada
|
3.2 (3.1–3.2)
|
0.98 (0.96–1.00)
|
3.0 (2.7–3.2)
|
1.13 (1.05–1.23)
|
|
USA
|
3.8 (3.8–3.8)
|
1.17 (1.16–1.18)
|
3.5 (3.5–3.6)
|
1.34 (1.32–1.36)
|
|
Denmark
|
4.1 (4.0–4.3)
|
1.29 (1.24–1.33)
|
3.4 (3.0–3.9)
|
1.32 (1.15–1.50)
|
|
Finland
|
3.2 (3.1–3.4)
|
1.00
|
2.6 (2.2–3.1)
|
1.00
|
|
Iceland
|
2.8 (2.3–3.3)
|
0.85 (0.71–1.02)
|
1.4 (0.5–3.0)
|
0.53 (0.20–1.16)
|
|
Norway
|
3.5 (3.3–3.6)
|
1.07 (1.03–1.12)
|
2.5 (2.1–2.9)
|
0.95 (0.80–1.12)
|
|
Sweden
|
3.5 (3.3–3.6)
|
1.07 (1.04–1.11)
|
2.9 (2.6–3.3)
|
1.12 (1.00–1.26)
|
|
BW (grams)
|
≥500
|
Canada
|
4.6 (4.5–4.6)
|
1.37 (1.34–1.39)
|
4.4 (4.1–4.7)
|
1.60 (1.49–1.70)
|
|
USA
|
5.1 (5.1–5.1)
|
1.53 (1.52–1.53)
|
4.8 (4.7–4.9)
|
1.74 (1.71–1.76)
|
|
Denmark
|
4.3 (4.1–4.4)
|
1.28 (1.23–1.32)
|
4.4 (3.9–4.9)
|
1.58 (1.40–1.77)
|
|
Finland
|
3.3 (3.2–3.5)
|
1.00
|
2.8 (2.4–3.2)
|
1.00
|
|
Iceland
|
3.8 (3.2–4.4)
|
1.14 (0.98–1.32)
|
3.5 (1.9–5.7)
|
1.26 (0.70–2.07)
|
|
Norway
|
4.2 (4.0–4.3)
|
1.26 (1.21–1.30)
|
3.1 (2.6–3.6)
|
1.11 (0.96–1.29)
|
|
Sweden
|
3.5 (3.4–3.6)
|
1.04 (1.01–1.08)
|
2.9 (2.6–3.2)
|
1.04 (0.92–1.17)
|
|
≥1000
|
Canada
|
3.2 (3.1–3.3)
|
1.29 (1.26–1.32)
|
2.9 (2.7–3.1)
|
1.36 (1.25–1.47)
|
|
USA
|
3.8 (3.8–3.8)
|
1.54 (1.53–1.55)
|
3.6 (3.6–3.7)
|
1.71 (1.68–1.74)
|
|
Denmark
|
3.9 (3.7–4.0)
|
1.57 (1.51–1.62)
|
3.5 (3.0–4.0)
|
1.65 (1.44–1.88)
|
|
Finland
|
2.5 (2.4–2.6)
|
1.00
|
2.1 (1.8–2.5)
|
1.00
|
|
Iceland
|
2.5 (2.1–3.0)
|
1.01 (0.83–1.21)
|
1.4 (0.5–3.0)
|
0.66 (0.24–1.44)
|
|
Norway
|
3.1 (3.0–3.3)
|
1.25 (1.20–1.31)
|
2.4 (2.0–2.8)
|
1.12 (0.94–1.33)
|
|
Sweden
|
3.2 (3.1–3.4)
|
1.31 (1.26–1.35)
|
2.7 (2.4–3.1)
|
1.28 (1.14–1.44)
|
|
All births
|
Canada
|
5.8 (5.7–5.9)
|
1.52 (1.49–1.55)
|
6.2 (5.9–6.6)
|
1.93 (1.83–2.04)
|
|
USA
|
7.0 (6.9–7.0)
|
1.81 (1.81–1.82)
|
6.7 (6.6–6.8)
|
2.08 (2.06–2.11)
|
|
Denmark
|
4.4 (4.2–4.5)
|
1.14 (1.10–1.18)
|
4.8 (4.3–5.4)
|
1.50 (1.34–1.68)
|
|
Finland
|
3.8 (3.7–4.0)
|
1.00
|
3.2 (2.8–3.7)
|
1.00
|
|
Iceland
|
4.3 (3.7–4.9)
|
1.11 (0.97–1.28)
|
4.9 (3.0–7.4)
|
1.51 (0.94–2.31)
|
|
Norway
|
8.9 (8.7–9.1)
|
2.32 (2.26–2.38)
|
7.9 (7.2–8.6)
|
2.45 (2.23–2.69)
|
|
Sweden
|
3.5 (3.4–3.6)
|
0.91 (0.88–0.94)
|
2.9 (2.6–3.3)
|
0.91 (0.81–1.02)
|
- Rates are expressed per 1,000 total births
- aDenmark and Sweden did not report stillbirths less than 28 weeks until 2004 and 2008, respectively
- Only births with gestational age <22 weeks excluded from the rate calculation for births ≥22 weeks i.e., births with unknown gestational age included in the calculations. Calculations of rates for births ≥28 weeks and birth weight ≥500 g and ≥1000 g were carried out in a similar manner. Finland was used as the reference category for calculation of rate ratios
