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Prevalence of RA in the Chinese 12-year-old children was relatively high compared with other studies. RA and CA had mainly 'WTR' astigmatism, while IA was mainly ATR and partially compensated for CA. Girls had greater means and prevalences of CA and IA than did boys. Both RA and CA, but not IA, increased with refractive errors away from emmetropia.
He et al. (Thu,) studied this question.