Table 1 Characteristics of the two groups ( $\overline{\mathbf{x}}\pm s$ )

Age

28.64(8.01)

25.42(7.44)

18-39

0.099

Sex(male/female)

15 /19

16/20

—

0.978^△

Axial length

26.84(1.23)

26.87(0.84)

24.24-29.84

0.916

Spherical equivalent

−8.06(2.20)

−8.10(1.28)

−6.00— -15.50

0.930

Spherical refraction

−7.83(2.13)

−7.53(1.32)

−5.50— -15.00

0.473

Total astighmatism

−0.49(0.44)

−1.15(0.67)

0.00— -2.50

0.026

Corneal astigmatism

−0.67(0.28)

−1.65(0.49)

−0.20— -3.30

0.000