Table 3.
Perinatal mortality ratio (number of stillbirths and early neonatal deaths per 1000 deliveries) in the ten Robson groups, 2000 to 2011
| Robson group | 2000–2002 | 2003–2005 | 2006–2008 | 2009–2011 | 2000–2011 | p -value |
|---|---|---|---|---|---|---|
| 1. Nullipara, single, cephalic, birth weight ≥ 2.5 kg, spontaneous labour |
70 (1094/15,688) |
55 (584/10,607) |
61 (533/8687) |
55 (410/7430) |
62 (2621/42,412) |
< 0.001 |
| 2. Nullipara, single, cephalic, birth weight ≥ 2.5 kg, induced labour or elective CS |
110 (26/236) |
153 (23/150) |
119 (8/67) |
31 (10/320) |
87 (67/773) |
< 0.001 |
| 3. Multipara, no previous CS, single, cephalic, birth weight ≥ 2.5 kg, spontaneous labour |
55 (976/17,679) |
50 (713/14,229 |
52 (556/10,749) |
59 (592/10,098) |
54 (2837/52,755) |
0.381 |
| 4. Multipara, no previous CS, single, cephalic, birth weight ≥ 2.5 kg, induced labour or elective CS |
86 (13/152) |
99 (10/101) |
23 (1/43) |
46 (24/518) |
59 (48/814) |
0.023 |
| 5. Previous CS, single, cephalic, birth weight ≥ 2.5 kg |
43 (126/2948) |
27 (68/2561) |
36 (86/2404) |
29 (121/4182) |
33 (401/12,095) |
0.014 |
| 6. Nullipara, single, breech |
299 (140/469) |
207 (43/208) |
185 (33/178) |
165 (30/182) |
237 (246/1037) |
< 0.001 |
| 7. Multipara, single, breech |
307 (183/597) |
246 (87/354) |
241 (57/237) |
243 (69/284) |
269 (396/1472) |
0.024 |
| 8. Multiple pregnancies |
158 (258/1638) |
132 (163/1237) |
109 (119/1094) |
96 (114/1189) |
127 (654/5158) |
< 0.001 |
| 9. Single, transverse or oblique lie |
238 (67/282) |
191 (33/173) |
167 (1/6) |
176 (12/68) |
214 (113/529) |
0.197 |
| 10. Single, cephalic, birth weight < 2.5 kg |
334 (2347/7033) |
316 (1504/4760) |
323 (1345/4170) |
302 (1234/4086) |
321 (6430/20,049) |
0.002 |
| Total | 112 (5230/46,722) | 94 (3228/34,380) | 99 (2739/27,635) | 92 (2616/28,357) | 101 (13,813/137,094) | < 0.001 |
P-value for test of trend.