Is it? Have I just really badly misunderstood? > Starting again from the standard normal, adding 0.10 SD to the male mean would lead to a 1.2 to 1 male to fema

Is it? Have I just really badly misunderstood? > Starting again from the standard normal, adding 0.10 SD to the male mean would lead to a 1.2 to 1 male to female ratio (at ≥1.5SD); but adding a full SD would give almost 5:1 [emphasis mine]