| Second grade | Fourth grade | Sixth grade | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
IG | CG | IG | CG | IG | CG | |||||||
n | % | n | % | n | % | n | % | n | % | n | % | |
Gendera | ||||||||||||
Male | 28 | 63.6 | 22 | 44.9 | 40 | 59.7 | 32 | 59.3 | 18 | 39.1 | 27 | 43.5 |
Female | 16 | 36.4 | 27 | 55.1 | 27 | 40.3 | 22 | 40.7 | 28 | 60.9 | 35 | 56.5 |
PI(M ± SD)b | 1.7 ± 0.5 | 1.5 ± 0.6 | 1.7 ± 0.5 | 1.5 ± 0.9 | 1.5 ± 0.6 | 1.3 ± 0.5 | ||||||
PCR(M ± SD)b | 46.6 ± 18.3 | 45.5 ± 22.3 | 43.2 ± 20.8 | 41.1 ± 21.0 | 43.4 ± 22.1 | 39.7 ± 18.2 |