Novotny R, Grove J, Baruffi G, Zeitlin M
Department of Food Science and Human Nutrition, College of Tropical Agriculture and Human Resources, University of Hawaii, Honolulu 96822.
Hum Biol. 1992 Oct;64(5):727-39.
We examine variation in the rate of growth in length of breast-feeding infants from rural Bangladesh. These data were collected between November 1985 and February 1986 from two rural sites. Eighty-eight infants, ranging from birth to 4 months of age at the start of the study and their mothers were measured monthly for 4 months. Length increased linearly with age over this 4-month period (infants' average bias-adjusted R2 = 0.90). The relationship between infant rate of growth in length and attained length was analyzed by two different methods: Oldham's (1962) method of regressing rate of growth on mean length and Blomqvist's (1977) method of regressing rate of growth on estimated initial length. The methods gave similar results. The rate of growth was negatively associated with mean infant length over the 4-month period (p less than 0.001); that is, shorter infants grew at a faster rate than longer infants. For every centimeter shorter the infant was, the rate of growth was 0.1 cm/mo faster on average; the effect was greater among males than among females. The average rate of growth was greater for males than for females and greater in financially solvent households and varied by site. Infant growth rate was slower among older infants than among younger infants, as expected. However, after adjusting for mean infant length, age was no longer significantly associated with infant growth rate, although mean infant length remained highly significant. Forty-one percent of the variation in infant rate of growth in length was explained by mean infant length, sex, sex by length interaction, household financial solvency, and site.
我们研究了孟加拉国农村地区母乳喂养婴儿的身长增长速率差异。这些数据于1985年11月至1986年2月期间在两个农村地点收集。88名婴儿在研究开始时年龄从出生至4个月，他们及其母亲在4个月内每月进行测量。在这4个月期间，身长随年龄呈线性增长（婴儿平均偏差调整后的R2 = 0.90）。通过两种不同方法分析了婴儿身长增长率与已达到身长之间的关系：奥尔德姆（1962年）将生长速率回归到平均身长的方法，以及布洛姆奎斯特（1977年）将生长速率回归到估计初始身长的方法。这两种方法得出了相似的结果。在这4个月期间，生长速率与婴儿平均身长呈负相关（p小于0.001）；也就是说，较短的婴儿比较长的婴儿生长速度更快。婴儿每短1厘米，平均生长速率就快0.1厘米/月；男性的这种影响大于女性。男性的平均生长速率高于女性，在经济状况良好的家庭中更高，且因地点而异。正如预期的那样，年龄较大的婴儿的生长速率比年龄较小的婴儿慢。然而，在调整了婴儿平均身长之后，年龄与婴儿生长速率不再显著相关，尽管婴儿平均身长仍然高度显著。婴儿身长增长率41%的变异可由婴儿平均身长、性别、性别与身长的交互作用、家庭经济偿付能力和地点来解释。
