Journal of Population Sciences
Table 5 Descriptive statistics of cases having missing values on LBW
From: Inequalities at birth: stable socioeconomic differences in birth outcomes in three British cohorts
| Â | Â | Cohort: | Â |
|---|---|---|---|
NCDS (1958) | B70 (1970) | MCS (2001) | |
Mean/% | Mean/% | Mean/% | |
Independent variables | Â | Â | Â |
Social background | Â | Â | Â |
 High | 25.60 | 40.00 | 14.54 |
 Low | 74.40 | 60.00 | 85.46 |
Smoking in pregnancy (SIP) | 31.80 | 45.16 | 26.73 |
Controls | Â | Â | Â |
 Female | 46.02 | 46.15 | 40.54 |
 Maternal Height (cm) | 160.98 | 161.42 | 161.48 |
Maternal age | Â | Â | Â |
  < 19 | 5.23 | 3.23 | 0.78 |
 20–29 | 59.87 | 67.74 | 43.39 |
 30–39 | 32.39 | 29.03 | 38.35 |
 40 +  | 2.53 | – | 10.46 |
Marital status | Â | Â | Â |
 Married | 95.42 | 70.97 | 39.88 |
 Non-Married | 4.58 | 69.03 | 60.12 |
Birth order | Â | Â | Â |
 First born | 43.29 | 29.03 | 52.57 |
 Second born | 29.07 | 22.58 | 24.41 |
 Third + born | 27.65 | 49.39 | 23.02 |
Timing of prenatal care | Â | Â | Â |
 Before 12th week | 22.90 | 22.58 | 41.41 |
 12th to 23rd week | 61.78 | 38.71 | 45.54 |
 After 23rd week | 14.33 | 38.71 | – |
 No visits | 0.99 | – | 18.05 |
N | 1776 | 31 | 65 |