Table 1.

Baseline characteristics according to age group and refractive error group.

	Total	Aged 20–39 yr (n = 39)	Aged 40–49 yr (n = 33)	Aged 50–59 yr (n = 59)	Aged 60–69 yr (n = 88)
Characteristics	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
Age (yr)	52.70 (13.10)	29.18 (5.00)	45.48 (2.76)	55.34 (2.56)	64.14 (2.66)
Spherical refractive error (diopter)
Emmetropes	0.11 (0.26)	0.02 (0.23)	–0.06 (0.18)	0.16 (0.28)	0.17 (0.25)
Hyperopes	1.49 (0.70)	1.04 (0.37)	1.06 (0.31)	1.43 (0.59)	1.60 (0.76)
Myopes	–2.01 (1.58)	–1.27 (0.94)	–2.28 (1.70)	–2.36 (1.68)	–1.84 (1.48)
Pupil diameter (mm)
Emmetropes	5.36 (0.76)	5.69 (0.66)	5.79 (0.79)	5.39 (0.73)	5.04 (0.70)
Hyperopes	5.06 (0.73)	4.32 (0.47)	5.12 (0.45)	5.23 (0.74)	5.08 (0.73)
Myopes	5.45 (0.89)	5.80 (0.89)	5.69 (0.72)	5.08 (0.94)	5.26 (0.77)

Values presented as mean ± SD for continuous variables.

SD = standard deviation.