Descriptive statistics for continuous exposure measures
| Smoking pregnancies | Non-smoking pregnancies | |||
| Mean | SD | Mean | SD | |
| Tobacco retailer density (outlets per km2) | 6.25 | 7.37 | 5.91 | 7.26 |
| Neighbourhood prevalence (proportion of intermediate data zone) | 0.38 | 0.19 | 0.22 | 0.18 |