The Medium-term Effects of Home-based Early Childhood Development Intervention Impact Evaluation 2011, Midline Survey - Colombia

Abstract
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The Medium-Term Effects of Home-based Early Childhood Development Intervention Impact Evaluation (ECDIIE) covered 96 small towns in central Colombia, representing a large number of small communities across a relatively big geographical area. It exploited structures in place from the government's Conditional Cash Transfer Programme, Familias en Accion (FeA), which targets the poorest 20% of households in the country.

There are currently three waves of data, a baseline, pre-intervention wave collected between February and June 2010, and a follow-up wave 18 months later between September and December 2011, at the end of the intervention period. The second wave of follow-up data collection occurred 2 years after the first follow-up data collection between September and December 2013.

The beneficiaries of FeA periodically elect a female representative, called the Madre Lider (ML). We randomly selected three from each town (municipality), and then from the families represented by the ML we randomly selected 5 children aged 12 to 24 months to be eligible for the intervention. Within each municipality, eligible households were randomly allocated (at the municipality level) to each of the following treatment arms:

1. Control

2. Stimulation + Supplementation

3. Stimulation

4. Supplementation

The stimulation intervention consisted of weekly visits to the homes of the target children, each visit lasting around one hour. The home visitors received a three-week training programme in activities designed to stimulate children at different ages. They also received a weekly curriculum as a guide, and a set of locally produced materials (homemade toys from recycling material, picture books, puzzles, etc.).

The supplementation arm consisted of providing daily sachets of multiple micronutrient powder to mothers, via the home visitors, to add to the target child's food. Sachets were designed to provide iron (12.5mg), zinc (5mg), Vitamin A (300 µg retinol equivalent), Vitamin C (30mg) and folic acid (160 µg) for the children targeted.

Kind of data
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Sample survey data [ssd]

Sampling procedure
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The survey used a randomized experimental design to obtain rigorous and unbiased estimates of the impact of the stimulation and nutrition interventions, and of their interaction.

Mode of data collection
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Computer Assisted Personal Interview [capi]

Research instrument
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At follow up, it was collected a variety of developmental indicators, including the Bayley test (for cognitive, language and motor development), the MacArthur Communicative Development Inventories (for vocabulary and expressive language), the Bates Infant Characteristics Questionnaire (for temperament), and the Rothbart Infant Behaviour Questionnaires (for attention focusing, inhibitory control and sociability amongst other socio-emotional traits). These data were again complemented by an extensive socio-economic questionnaire which included information on parental investments, time use and so on.

摘要
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本研究评估了基于家庭的儿童早期发展干预效果（ECDIIE）的中期影响，该研究覆盖了哥伦比亚中部的96个小城镇，代表了相对广阔地理区域内众多小型社区。研究利用了政府有条件现金转移计划——‘行动家庭’（FeA）中现有的结构，该计划旨在帮助国家最贫穷的20%的家庭。

目前共有三波数据，包括基线波次（2010年2月至6月收集的干预前波次）和干预期结束后的18个月后的后续波次（2011年9月至12月），以及首次后续数据收集后的第二年（2013年9月至12月）进行的第二次后续数据收集波次。

FeA的受益者定期选举一位女性代表，称为‘母亲领袖’（ML）。我们从每个城镇（市镇）中随机选取三位，然后从由ML代表的家庭中随机选取5名12至24个月大的儿童作为干预的合格对象。在每个市镇内，合格的家庭被随机分配到以下治疗组之一：（1）对照组；（2）刺激+补充；（3）刺激；（4）补充。

刺激干预包括每周对目标儿童家庭进行大约一小时的访问。访视员接受了一项为期三周的培训计划，学习旨在刺激不同年龄段儿童的活动。他们还收到了一份每周课程指南，以及一套当地生产的材料（回收材料制成的玩具、图画书、拼图等）。

补充组包括通过访视员为母亲提供每日的多微营养素粉剂，以补充目标儿童的食物。这些粉剂旨在为儿童提供铁（12.5mg）、锌（5mg）、维生素A（300 µg视黄醇当量）、维生素C（30mg）和叶酸（160 µg）。

数据类型
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样本调查数据 [ssd]
抽样程序
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调查采用了随机实验设计，以获得刺激和营养干预及其相互作用影响的严谨且无偏估计。
数据收集方式
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计算机辅助个人访谈 [capi]
研究工具
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在后续研究中，收集了各种发展指标，包括贝利量表（用于认知、语言和运动发展）、麦克阿瑟沟通发展存货量表（用于词汇和表达性语言）、贝茨婴儿特征问卷（用于气质）和罗思巴特婴儿行为问卷（用于注意力集中、抑制控制和社交等社会情感特质）。这些数据还辅以一份广泛的社会经济问卷，其中包含了关于父母投资、时间使用等方面的信息。