| Non Letter-Sound Readers | Letter-Sound Readers |
48 - 59 months | 0.15 (SD = 0.37) | 14.38 (SD = 10.14) |
60 - 71 months | 1.80 (SD = 4.36) | 16.60 (SD = 12.98) |
72 - 80 months | 0.40 (SD = 0.90) | 21.45 (SD = 10.14) |