downs.mi {dsrTest}

Downs' syndrome cases and of total live births by maternal age and birth order, Michigan, 1950-1964.

Description

This data reproduces table 14.4 in Fleiss (1981) and which is drawn from a large-scale study in Michigan 1950-1964 of the effect of Maternal age and Birth order on Down Syndrome and Leukemia (Stark and Mantell, 1966).

Usage

downs.mi

Format

This data.frame contains the following columns:

Age

The age category of the mothers.

BirthOrder

The birth order.

Cases

The number of cases of Down's Syndrome.

Births

The number of live births.

Standard

A "standard" population, derived as the total number of births in each age category

Source

The data were obtained from table 14.4 (p 249) in

Fleiss, JL (1981) Statistical Methods for Rates and Proportions, Wiley, New York.

The original study is

Stark CR and Mantel N (1966) 'Effects of maternal age and birth order on the risk of mongolism and leukemia' J Natl Cancer Inst 37 (5) 687–698. doi:10.1093/jnci/37.5.687