Department of Economics, Middlebury College, Middlebury, VT 05753, USA.
J Nutr. 2010 Jun;140(6):1139-45. doi: 10.3945/jn.109.114272. Epub 2010 Apr 14.
Rigorous evaluations of food-assisted maternal and child health and nutrition programs are stymied by the ethics of randomizing recipients to a control treatment. Using nonexperimental matching methods, we evaluated the effect of 2 such programs on child linear growth in Haiti. The 2 well-implemented programs offered the same services (food assistance, behavior change communication, and preventive health services) to pregnant and lactating women and young children. They differed in that one (the preventive program) used blanket targeting of all children 6-23 mo, whereas the other (the recuperative program) targeted underweight (weight-for-age Z score < -2) children 6-59 mo, as traditionally done. We estimated program effects on height-for-age Z scores (HAZ) and stunting (HAZ < -2) by comparing outcomes of children in program areas with matched children from comparable populations in the Haiti Demographic and Health Survey. Children 12-41 mo in the preventive and recuperative program areas had lower prevalence of stunting than those in the matched control group [16 percentage points (pp) lower in preventive and 11 pp in recuperative]. Children in the 2 program areas also were more likely than those in the matched control group to be breast-fed up to 24 mo (25 pp higher in preventive, 22 in recuperative) and children 12 mo and older were more likely to have received the recommended full schedule of vaccinations (32 pp higher in preventive, 31 in recuperative). Both programs improved targeted behaviors and protected child growth in a time of deteriorating economic circumstances.
严格评估以食物辅助的母婴健康和营养计划受到将接受者随机分配到对照组的伦理问题的阻碍。我们使用非实验性匹配方法,评估了海地的两项此类计划对儿童线性生长的影响。这两个执行良好的项目为孕妇和哺乳期妇女以及幼儿提供了相同的服务(食物援助、行为改变沟通和预防保健服务)。它们的不同之处在于,其中一个(预防项目)对所有 6-23 个月的儿童进行全面目标定位,而另一个(恢复项目)则针对体重不足(体重年龄 Z 分数< -2)的儿童 6-59 个月,这是传统做法。我们通过比较计划地区儿童的结果与海地人口与健康调查中可比人群的匹配儿童的结果,来估计项目对身高年龄 Z 分数(HAZ)和发育迟缓(HAZ < -2)的影响。预防和恢复项目地区 12-41 个月的儿童比匹配对照组的儿童发育迟缓的比例低[预防组低 16 个百分点,恢复组低 11 个百分点]。与匹配对照组相比,两个项目地区的儿童更有可能在 24 个月之前接受母乳喂养(预防组高 25 个百分点,恢复组高 22 个百分点),12 个月及以上的儿童更有可能接受建议的完全疫苗接种计划(预防组高 32 个百分点,恢复组高 31 个百分点)。这两个项目都在经济环境恶化的情况下改善了目标行为并保护了儿童的生长。