Table 1 Comparison of women who had an extra research blood sample collected at routine venipuncture with those who did not in terms of routine collected data
Did not have an extra sample taken (613) | Had an extra sample taken (3583) | P Value | |
|---|---|---|---|
Area based deprivation, SIMD quintile, 1 = most deprived; 5 = least deprived | |||
SIMD 1 | 266 (46.2) | 1306 (38.0) | |
SIMD 2 | 105 (18.2) | 604 (17.6) | |
SIMD 3 | 73 (12.7) | 435 (12.7) | |
SIMD 4 | 64 (11.1) | 484 (14.1) | |
SIMD 5 | 68 (11.8) | 607 (17.7) | |
Missing | 37 | 147 | < 0.001 |
Age category (years) | |||
15 to 20 years | 30 (5.1) | 128 (3.6) | |
20 to 30 years | 234 (39.5) | 1406 (39.5) | |
30 to 40 years | 306 (51.6) | 1860 (52.3) | |
40 to 50 years | 23 (3.9) | 165 (4.6) | |
Missing | 20 | 24 | < 0.001 |
BMI (kg/m sq) | |||
Underweight | 15 (4.4) | 57 (3.1) | |
Normal | 160 (47.3) | 901 (48.8) | |
Over weight | 163 (48.2) | 889 (48.1) | |
Missing | 275 | 1736 | 0.704 |
Previous pregnancies | |||
0 | 231 (51.9) | 1289 (54.5) | |
1 | 113 (25.4) | 607 (25.6) | |
2 | 52 (11.7) | 250 (10.6) | |
3 | 20 (4.5) | 112 (4.7) | |
4+ | 29 (6.5) | 109 (4.6) | |
Missing | 168 | 1216 | 0.121 |
Previous spontaneous abortions | |||
0 | 350 (78.5) | 1912 (80.7) | |
1 | 68 (15.3) | 308 (13.0) | |
2 | 17 (3.8) | 93 (3.9) | |
3 | 11 (2.5) | 55 (2.3) | |
Missing | 167 | 1215 | 0.467 |
Previous therapeutic abortions | |||
0 | 429 (96.2) | 2234 (94.0) | |
1 | 17 (3.8) | 143 (6.0) | |
Missing | 167 | 1206 | 0.065 |
Previous caesarians | |||
0 | 408 (91.9) | 2192 (92.5) | |
1 | 36 (8.1) | 177 (7.5) | |
Missing | 169 | 1214 | 0.642 |
Smoking history | |||
Current smoker | 44 (9.5) | 278 (11.2) | |
Former smoker | 28 (6.1) | 146 (5.9) | |
Never smoked | 274 (59.4) | 1463 (59.0) | |
Not known | 115 (25.0) | 592 (23.9) | |
Missing | 152 | 1104 | 0.751 |
Smoking while pregnant | |||
No | 317 (68.8) | 1667 (67.2) | |
Yes | 40 (8.7) | 272 (11.0) | |
Not known | 104 (22.6) | 540 (21.8) | |
Missing | 152 | 1104 | 0.338 |
Alcohol referral to intervention nurse | |||
No | 604 (98.5) | 3470 (96.9) | |
Yes | 9 (1.5) | 113 (3.2) | |
missing | 0 | 0 | 0.022 |
Units of alcohol drunk now | |||
Nil | 505 (94.4) | 2860 (91.6) | |
At least one unit | 30 (5.6) | 262 (8.4) | |
missing | 78 | 461 | 0.028 |
Units drunk daily before pregnant | |||
Nil | 488 (90.5) | 2694 (85.9) | |
1–4 | 41 (7.6) | 412 (13.1) | |
5+ | 10 (1.9) | 31 (1.0) | |
missing | 74 | 446 | < 0.001 |
Alcohol intervention required | |||
No | 446 (72.8) | 2369 (66.1) | |
Yes | 167 (27.2) | 1214 (33.9) | |
missing | 0 | 0 | 0.001 |
Median IQR | Median IQR | ||
Estimated gestation | 39 (38–40) | 39 (38–40) | 0.100 |
Birthweight | 3366 (3050–3696) | 3394 (3066–3725) | 0.483 |
CO Carbon Monoxide | 1 (1–2) | 1 (1–2) | 0.229 |