Fig. 3

The marital birth ratio, b_w, vs. the calculated marital birth ratio based off marriage and fertility data for all 5-year age groups except ages 15–19 and years of 1941, 1950, 1960, 1970, 1980, and 1990 for Swiss women. Colors for age groups are 20–24 (green), 25–29 (orange), 30–34 (red), 35–39 (blue), and 40–44 (gray). The measured R² is 0.99. The 15–19 age group is excluded due to gaps in marriage data up until 1980. See details in Appendix