The growth of London schoolchildren 1904–1966: An analysis of secular trend and intra-county variation

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Abstract
Height and weight were measured on 299,303 children involved in 11 London County Council Surveys dating from 1904 to 1966. This paper describes the historical background to these surveys, the secular trend towards increasing heights and weights and a decreasing age at menarche, and the variation of height and weight between different parts of the county. All the surveys were cross-sectional, but that of 1966 included yearly velocity data on 13, 806 children. Means for height and weight by age and sex were adjusted to the exact half year to allow comparison of all surveys. Menarcheal age was determined by probit analysis on status quo data in 1954, 1959 and 1966. Intra-county comparisons were based on the Divisional Index of the nine Area Health Divisions of the County. An end is seen to the positive secular trend for height and weight at about the same time as the previously reported end to a decreasing age of menarche in London girls. Intra-county comparisons indicated different rates of secular trend within different areas favoring those children who were the smallest and lightest in 1949. The end of the secular trend may be due to genetic factors and intra-county changes to improve environmental conditions.