The pregnancy prevalence of neural tube defects (NTDs) for each 1000 live births from 1983–95; the proportion of domestic water lead concentrations >10 μg/litre according to Carstairs deprivation category
| Carstairs deprivation category | Pregnancy prevalence NTDs/1000 live births 1983–95 |
Proportion of water with lead values > 10 μg/l (95% CI) |
| 1 | 1.6 | 0.16 (0.11 to 0.21) |
| 2 | 2.2 | 0.28 (0.21 to 0.34) |
| 3 | 2.2 | 0.21 (0.14 to 0.28) |
| 4 | 2.2 | 0.29 (0.24 to 0.33) |
| 5 | 2.5 | 0.26 (0.19 to 0.32) |
| 6 | 2.6 | 0.17 (0.13 to 0.21) |
| 7 | 2.8 | 0.12 (0.09 to 0.15) |
CI, confidence interval.