SECULAR GROWTH CHANGES IN THE STATURE AND WEIGHT OF AMERINDIAN SCHOOLCHILDREN AND ADULTS IN THE CHILEAN ANDES, 1972-1987

A positive secular trend for stature and weight is evident in rural Ay mara-speaking Indians of the Parinacota Province (>3,000 m) in the nor thern Chilean Andes. The study is based on two cross-sectional growth surveys carried out in 1972 and 1987. In the survey of 1972, which was undertaken by other authors, a sample of 190 individuals was consider ed. The 1987 survey, performed by the present author, comprises a samp le of 170 Indians. Both children and adults of each sex, ages 6-29 yea rs, are included. Secular comparisons of age-grouped means indicate a secular increase in stature and weight in Aymara children, adolescents , and adults in the Parinacota Province between 1972 and 1987. The Aym ara tend to be taller and heavier in 1987. The estimated secular incre ase for stature is 2.1 cm/decade for males and 1.8 cm/decade for femal es. For weight, the increase is 2.3 kg/decade for males and 1.5 kg/dec ade for females. In all cases, growth gains tend to be greater in male s than in females. The body mass index also increases slightly. The se cular changes in stature and weight are statistically significant in b oth sexes. From additional nutritional data on the Aymara samples comp ared, it is concluded that the observed secular increases might primar ily reflect improved food supply over the past two decades. (C) 1998 W iley-Liss, Inc.