Table 1. Sample size at each wave, children’s ages, and PPVT scores with available sample.

	Sample at each wave			Measures
Wave	N	Child’s age in months			N1	Mean (SD)	Range
		Median	Range	Measure
1	4983	57	51–67	PPVT	4406	65 (6.0)	28–85
2	4464	82	75–94	PPVT	4317	74 (5.0)	46–92
3	4331	105	95–119	PPVT	4273	78 (5.0)	45–106