Table 2. Spherical Equivalent (SE) in Right Eyes Determined by Autorefraction and Retinoscopy.
Age (yrs) | N | SE (D) | |||||
Mean | SD | Median | Range | Kurtosis | Skewness | ||
All children | 2478 | 1.42(1.54) | 0.79(0.76) | 1.38(1.50) | 15.25(14.50) * | 13.61(10.78) # | 0.05(0.39) |
3 | 373 | 1.44(1.58) | 0.76(0.713) | 1.38(1.50) | 5.62(5.620) | 1.61(1.77) | 0.39(0.38) |
4 | 817 | 1.47(1.90) | 0.82(0.78) | 1.38(1.50) | 9.00(8.75) | 3.98(4.30) | 0.80(0.94) |
5 | 846 | 1.41(1.53) | 0.82(0.82) | 1.38(1.50) | 15.25(14.00)* | 29.23(20.82)# | −0.85(−0.11) |
6 | 442 | 1.33(1.45) | 0.70(0.66) | 1.25(1.50) | 5.38(5.50) | 1.76(1.89) | 0.13(0.22) |
P trend | 0.03 | ||||||
Boys | 1309 | 1.35(1.49) | 0.71(0.68) | 1.25(1.25) | 6.00(6.12) | 2.01(2.11) | 0.49(0.56) |
3 | 201 | 1.34(1.49) | 0.72(0.66) | 1.38(1.50) | 4.75(4.75) | 1.00(1.30) | 0.05(−0.06) |
4 | 433 | 1.46(1.59) | 0.78(0.74) | 1.38(1.50) | 5.25(5.12) | 2.41(2.63) | 0.95(1.09) |
5 | 437 | 1.33(1.46) | 0.64(0.64) | 1.25(1.50) | 3.88(4.12) | 0.39(0.51) | 0.26(0.32) |
6 | 238 | 1.22(1.34) | 0.66(0.63) | 1.25(1.25) | 4.75(5.12) | 1.93(2.02) | −0.33(−0.20) |
P trend | <0.001 | ||||||
Girls | 1169 | 1.49(1.61) | 0.87(0.83) | 1.50(1.50) | 15.25(14.0) * | 18.90(14.73) # | −0.30(0.20) |
3 | 172 | 1.56(1.67) | 0.78(0.76) | 1.50(1.63) | 5.38(5.12) | 1.89(1.75) | 0.66(0.65) |
4 | 384 | 1.48(1.62) | 0.87(0.83) | 1.50(1.50) | 9.00(8.75) | 5.08(5.43) | 0.66(0.80) |
5 | 409 | 1.49(1.60) | 0.98(0.98) | 1.50(1.50) | 15.25(14.00)* | 30.69(22.80)# | −1.28(−0.37) |
6 | 204 | 1.47(1.58) | 0.71(0.66) | 1.50(1.50) | 4.50(4.25) | 1.25(1.45) | 0.50(0.61) |
P trend | 0.76 |
Data in parentheses were determined by retinoscopy.
There is one outlier with myopia of −8.50 D in the right eye (female, aged 5). When this outlier is excluded, the range decreases to 9.62(10.12), 7.25(8.00), 9.62(10.12) and 7.12(7.88) for all children, 5-year-old children, all girls and 5-year-old girls, respectively.
When this outlier is excluded, the kurtosis decreases to be 4.59(6.26), 7.55(10.71), 5.79(7.94) and 8.61(11.65) for that in all children, the 5-year-old children, all girls and the 5-year-old girls, respectively.