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. 2015 Sep 9;10(9):e0135612. doi: 10.1371/journal.pone.0135612

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

Sample at each wave Measures
Wave N Child’s age in months N 1 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
4 4169 130 121–140 ARS 3336 3.79 (0.9) 1–5

1Available sample size.