Robson group | 2000–2002 | 2003–2005 | 2006–2008 | 2009–2011 | 2000–2011 | Relative change in % |
---|---|---|---|---|---|---|
1. Nullipara, single, cephalic, birth weight ≥ 2.5 kg, spontaneous labour | 17% (2628/15,688) | 26% (2709/10,607) | 35% (2998/8687) | 44% (3250/7430) | 27%a (11,585/42,412) | 159%c |
2. Nullipara, single, cephalic, birth weight ≥ 2.5 kg, induced labour or elective CS | 37% (87/236) | 59% (88/150) | 70% (47/67) | 91% (290/320) | 66%a (512/773) | 146%c |
3. Multipara, no previous CS, single, cephalic, birth weight ≥ 2.5 kg, spontaneous labour | 12% (2148/17,679) | 19% (2644/14,229) | 28% (2974/10,749) | 33% (3293/10,098) | 21%a (11,059/52,755) | 175%c |
4. Multipara, no previous CS, single, cephalic, birth weight ≥ 2.5 kg, induced labour or elective CS | 26% (39/152) | 48% (48/101) | 74% (32/43) | 91% (472/518) | 73%a (591/814) | 250%c |
5. Previous CS, single, cephalic, birth weight ≥ 2.5 kg | 75% (2213/2948) | 85% (2177/2561) | 95% (2284/2404) | 95% (3991/4182) | 88%a (10,665/12,095) | 27%c |
6. Nullipara, single, breech | 29% (137/469) | 44% (91/208) | 58% (104/178) | 67% (121/182) | 44%a (453/1037) | 131%c |
7. Multipara, single, breech | 21% (128/597) | 27% (95/354) | 38% (91/237) | 57% (161/284) | 32%a (475/1472) | 171%c |
8. Multiple pregnancies | 23% (375/1638) | 34% (425/1237) | 44% (483/1094) | 52% (622/1189) | 37%a (1905/5158) | 126%c |
9. Single, transverse or oblique lie | 85% (239/282) | 93% (160/173) | 67% (4/6) | 88% (60/68) | 88%b (463/529) | 3.5%c |
10. Single, cephalic, birth weight < 2.5 kg | 13% (941/7033) | 23% (1082/4760) | 23% (976/4170) | 37% (1494/4086) | 22%a (4493/20,049) | 185%c |
Total | 19% (8935/46,722) | 28% (9519/34,380) | 36% (9993/27,635) | 49% (13,754/28,357) | 31%a (42,201/137,094) | 158%c |