Example from Wacholder, S. 1986. Binomial regression in GLIM: Estimation risk ratios and risk differences. American Journal of Epidemiology 123: 174-184. https://doi.org/10.1093/oxfordjournals.aje.a114212.
Wacholder used data from Wright, J. T., et al. 1983. Alcohol consumption, pregnancy, and low birthweight. Lancet 1: 663-665. https://doi.org/10.1016/S0140-6736(83)91964-5.