Table 1.
Data sources
| United States | United Kingdom | Australia | Canada | |
|---|---|---|---|---|
| Survey | Early Childhood Longitudinal Study, Kindergarten Cohort (ECLS-K) | Millennium Cohort Study (MCS) | Longitudinal Study of Australian Children Kindergarten Cohort (LSAC-K) | National Longitudinal Study of Children and Youth (NLSCY) |
| Cohort Birthdates | 1992–1993 | 9/2000–1/2002 | 3/1999–2/2000 | 1/1991–12/1994 |
| Achieved Sample at Baseline | 19,170 | 18,818 | 4,980 | 8,605 |
| Analysis Sample Size | 8,370 | 11,762 | 3,900 | 4,298 |
| Mean Child Age at Cognitive Assessment | 5.7 years (Fall K) | 5.2 years | 4.9 years | 4.9 years |
| Early Literacy Measurement Instrument | ECLS-K Reading Test | BAS Naming Vocabulary Test | PPVT-III | PPVT-R |
| Study Information | Tourangeau et al. (2009) | Hansen (2014) | AIFS (2013) | Statistics Canada (2007) |