Sweden | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | p-value for trend4 |
---|---|---|---|---|---|---|---|---|---|---|---|
Deliveries (n) | 100319 | 93104 | 87451 | 84243 | 84473 | 87710 | 88634 | 92041 | 95740 | 98512 | |
22–27 w | 0.22 | 0.24 | 0.22 | 0.28 | 0.29 | 0.21 | 0.26 | 0.27 | 0.29 | 0.26 | 0.012 (I)5 |
28–31 w | 0.56 | 0.63 | 0.57 | 0.58 | 0.61 | 0.58 | 0.60 | 0.62 | 0.58 | 0.57 | 0.63 |
32–36 w | 4.9 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.8 | 4.8 | 4.8 | 5.0 | 0.91 |
< 37 w | 5.6 | 5.7 | 5.6 | 5.7 | 5.8 | 5.7 | 5.6 | 5.7 | 5.7 | 5.8 | 0.41 |
Women not born in Sweden | 17.5 | 17.7 | 18.0 | 18.3 | 18.2 | 18.2 | 18.5 | 18.8 | 19.0 | 19.8 | < 0.001 (I) |
IVF or ICSI | 0.6 | 1.4 | 1.8 | 1.6 | 1.8 | 1.6 | 1.8 | 2.0 | 2.2 | 2.2 | < 0.001 (I) |
Multiples | 1.5 | 1.5 | 1.6 | 1.6 | 1.6 | 1.5 | 1.6 | 1.5 | 1.7 | 1.4 | 0.48 |
Primiparous 1 | 40.2 | 41.3 | 41.4 | 41.5 | 42.3 | 44.0 | 44.7 | 45.5 | 45.2 | 45.0 | < 0.001 (I) |
Iatrogenic delivery 2 | 14.1 | 14.0 | 14.9 | 15.9 | 17.0 | 16.9 | 18.1 | 18.5 | 19.0 | 19.5 | < 0.001 (I) |
Age < 20 | 2.1 | 2.0 | 2.0 | 1.9 | 2.0 | 2.0 | 1.9 | 1.9 | 1.7 | 1.6 | < 0.001(R)6 |
Age ≥35 | 13.3 | 13.8 | 14.1 | 15.4 | 16.0 | 16.8 | 17.9 | 18.3 | 19.3 | 19.9 | < 0.001 (I) |
Reference population 3 (% of all births) | 29.6 | 29.9 | 30.0 | 29.6 | 29.9 | 31.2 | 31.3 | 31.7 | 31.1 | 30.3 | < 0.001 (I) |
Reference population 3 (n) | 29685 | 27875 | 26249 | 24926 | 25232 | 27354 | 27762 | 29133 | 29775 | 29825 |