2.1 Overview of cohorts and instruments
The Global Child Development Group (GCDG) collected longitudinal data from 16 cohorts. The objective of the study was to develop a population-based measure to monitor early child development across ages and countries. The requirements for inclusion were
- direct assessment of child development;
- availability of individual milestone scores;
- spanning ages between 0-5 years;
- availability of follow-up measures, at ages 5-10 years.
The effort resulted in a database containing individual data from over 16,000 children from 11 countries. The world map below (Figure: 2.1) colors the countries included in the study. Section 2.2 briefly describes each cohort. Section 2.3 reviews the measurement instruments.
Figure 2.1: Coverage of countries included in the study.
The GCDG data comprises of birth cohorts, impact evaluation studies and instrument evaluation studies. Table 2.1 displays a brief overview of the instruments used in each sub-study.
| Cohort | by |
den |
gri |
bat |
vin |
ddi |
bar |
tep |
asq |
sbi |
|---|---|---|---|---|---|---|---|---|---|---|
| Bangladesh | x | |||||||||
| Brazil 1 | x | |||||||||
| Brazil 2 | x | |||||||||
| Chile 1 | x | |||||||||
| Chile 2 | x | x | ||||||||
| China | x | |||||||||
| Colombia 1 | x | |||||||||
| Colombia 2 | x | x | x | x | ||||||
| Ecuador | x | |||||||||
| Ethiopia | x | |||||||||
| Jamaica 1 | x | |||||||||
| Jamaica 2 | x | |||||||||
| Madagascar | x | |||||||||
| Netherlands1 | x | |||||||||
| Netherlands2 | x | |||||||||
| South Africa | x | x | x |