Table 4 Frequencies and crude rates of convulsions and other disturbances of cerebral function (ICD10 diagnoses P90 and P91) in term singleton infants categorized by mode of delivery
N= 1,010,229 | Convulsions or encephalopathy n = 2,587 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Vaginal delivery | Emergency cesarean section | Vacuum extraction | |||||||
N =851,347 | N =75,216 | N = 87,150 | |||||||
N | n | 1/10,000 | N | n | 1/10 000 | N | n | 1/10 000 | |
Total | 851,347 | 1,113 | 13.1 | 75,216 | 627 | 83.4 | 87,150 | 847 | 97.2 |
Maternal age (years) | |||||||||
-19 | 16,256 | 16 | 9.8 | 859 | 6 | 69.8 | 1,384 | 11 | 79.5 |
20-34 | 676,207 | 875 | 12.9 | 55,934 | 457 | 81.7 | 70,645 | 673 | 95.3 |
>34 | 156,454 | 217 | 13.9 | 18,151 | 160 | 88.1 | 14,820 | 161 | 108.6 |
Missing | 2,430 | 5 | 20.6 | 272 | 4 | 147.1 | 301 | 2 | 66.4 |
Maternal height (cm) | |||||||||
-155 | 30,767 | 52 | 16.9 | 6,116 | 46 | 75.2 | 4,074 | 65 | 159.5 |
156-160 | 108,658 | 167 | 15.4 | 14,622 | 120 | 82.1 | 13,278 | 174 | 131.0 |
161-165 | 210,094 | 313 | 14.9 | 20,403 | 143 | 70.1 | 22,733 | 233 | 102.5 |
166-170 | 242,617 | 281 | 11.6 | 17,965 | 155 | 86.3 | 23,470 | 194 | 82.7 |
>170 | 208,213 | 224 | 10.8 | 11,276 | 107 | 94.9 | 18,240 | 131 | 71.8 |
Missing | 50,998 | 76 | 14.9 | 4,834 | 56 | 115.8 | 5,355 | 50 | 93.4 |
Maternal BMI | |||||||||
Underweight | 12,843 | 9 | 7.0 | 643 | 3 | 46.7 | 1,372 | 6 | 43.7 |
Normal | 311,523 | 343 | 11.0 | 22,768 | 165 | 72.5 | 33,207 | 288 | 8.67 |
Overweight | 121,733 | 170 | 14.0 | 13,246 | 109 | 82.3 | 12,395 | 141 | 113.8 |
Obese | 49,278 | 105 | 21.3 | 7,543 | 77 | 102.1 | 4,369 | 59 | 135.0 |
Missing | 355,970 | 486 | 13.7 | 31,016 | 273 | 88.0 | 35,807 | 353 | 98.6 |
Parity | |||||||||
Multipara | 516,619 | 514 | 9.9 | 26,521 | 265 | 99.9 | 18,091 | 177 | 97.8 |
Primi | 334,728 | 599 | 17.9 | 48,695 | 362 | 74.3 | 69,059 | 670 | 97.0 |
Indication | |||||||||
Signs of fetal distress | 9,403 | 81 | 86.1 | 22,320 | 415 | 185.9 | 22,320 | 300 | 102.6 |
Prolonged labour | 54,204 | 140 | 25.8 | 24,738 | 49 | 19.8 | 24,738 | 158 | 83.5 |
Both | 1,834 | 16 | 87.2 | 6,225 | 42 | 67.5 | 6,225 | 80 | 160.4 |
None of these | 785,906 | 876 | 11.1 | 21,933 | 121 | 55.2 | 21,933 | 309 | 60.9 |
Gestational week | |||||||||
37-38 | 138,934 | 178 | 12.8 | 12,641 | 94 | 74.4 | 9,949 | 103 | 103.5 |
39-41 | 656,094 | 807 | 12.3 | 48,343 | 419 | 86.7 | 66,020 | 581 | 88.0 |
42-45 | 56,319 | 128 | 22.7 | 14,232 | 114 | 80.1 | 11,181 | 163 | 145.8 |
Infant birth weight (g) | |||||||||
≤3000 | 80,674 | 149 | 18.5 | 8,334 | 111 | 133.2 | 7,985 | 59 | 73.9 |
3001-3500 | 280,255 | 298 | 10.6 | 19,163 | 166 | 86.6 | 26,914 | 230 | 85.5 |
3501-4000 | 320,650 | 344 | 10.7 | 24,807 | 184 | 74.2 | 32,870 | 298 | 90.7 |
4001-4500 | 136,803 | 205 | 15.0 | 16,236 | 102 | 62.8 | 15,596 | 167 | 107.1 |
>4500 | 30,861 | 87 | 28.2 | 6,455 | 29 | 44.9 | 3,571 | 61 | 170.8 |
Missing | 2,104 | 30 | 142.6 | 221 | 35 | 1,583.7 | 214 | 32 | 1495.3 |
Shoulder dystocia | |||||||||
No | 849,910 | 1,064 | 12.5 | 75,212 | 627 | 83.4 | 86,310 | 775 | 89.8 |
Yes | 1,437 | 49 | 341.0 | 4 | 0 | 840 | 72 | 857.1 | |