Martinez G A, Dodd D A, Samartgedes J A
Pediatrics. 1981 Dec;68(6):863-8.
From 1955 to 1980, mail questionnaires were administered to a nationally representative sample of mothers to determine the use of various milks for feeding infants during the first 6 months of life. Data from these surveys have demonstrated the resurgence of breast-feeding both in incidence and duration, and this increase has occurred across all income and educational levels. Statistical analysis indicated that the trends were significant (P less than .01) for all demographic categories surveyed. In January 1980, a bi-monthly telephone survey of mothers of infants 8, 10, and 12 months of age was initiated to determine milk use during later infancy. A combination of data from the mail and telephone surveys for 1980 provided information on milk feeding patterns for the first 12 months of life.
1955年至1980年期间，对全国具有代表性的母亲样本进行了邮寄问卷调查，以确定在婴儿出生后的头6个月里喂养婴儿所使用的各类奶类情况。这些调查数据表明，母乳喂养在发生率和持续时间上都出现了复苏，而且这种增长在所有收入和教育水平的人群中都有发生。统计分析表明，在所调查的所有人口类别中，这些趋势都具有显著性（P值小于0.01）。1980年1月，启动了一项针对8个月、10个月和12个月大婴儿母亲的双月电话调查，以确定婴儿后期的奶类使用情况。1980年邮寄调查和电话调查的数据相结合，提供了婴儿出生后头12个月奶类喂养模式的信息。
