Table IV.

Comparison of sex ratios in different population registries.

Age group SEALS	M:F ratio	Age group Lombardy	M:F ratio	Age group Ireland	M:F ratio
35–44*	2.5	<45	2.5	35–44	2.25
45–54	2.27	45–54	2.45	45–54	1.17
55–64	1.8	55–64	1.77	55–64	1.54
65–74	1.24	65–74	1.13	65–74	1.14
>75	1.43	>75	1.76	>75	2.62

The male:female (M:F) ratio drops in the Italian and English registers (but not the Irish) after age 55 years.

^*No incident cases were recorded in one or other category below age 35 years, so a meaningful ratio cannot be constructed.