Early Age of the First Myopic Spectacle Prescription, as an Indicator of Early Onset of Myopia, Is a Risk Factor for High Myopia in Adulthood

Table 1

Demographics and baseline results of all participants.

Clinical parameters	Results
Total (n)	331
Sex (male, (%))	95 (28.7%)
Age (years)	32.86 ± 4.63 (22–44)
Myopia (diopter)	−4.04 ± 2.63 (−11.00∼1.25)
High myopia	91 (27.5%)
Parents’ high myopia
Father	11 (3.3%)
Mother	20 (6.0%)
First spectacles
Age (years)	13.35 ± 3.80 (2∼30)
Before 15 years old	238 (71.9%)
Before 12 years old	116 (35.0%)
Diopter	−1.63 ± 0.99 (−5∼−0.5)
Primary school
Near work (hr/wk)	19.04 ± 15.68 (0∼106)
Outdoor sport (hr/wk)	4.13 ± 7.31 (0∼50)
Indoor sport (hr/wk)	1.31 ± 3.49 (0∼25)
After-school class attendance	130 (39.3%)
Sport team	46 (13.9%)
Junior high school
Near work (hr/wk)	22.22 ± 16.55 (0∼105)
Outdoor sport (hr/wk)	2.71 ± 6.21 (0∼72)
Indoor sport (hr/wk)	0.97 ± 3.28 (0∼48)
After-school class attendance	250 (75.5%)
Sport team	19 (5.7%)
Senior high school
Near work (hr/wk)	23.60 ± 18.38 (0∼105)
Outdoor sport (hr/wk)	1.97 ± 4.34 (0∼50)
Indoor sport (hr/wk)	0.74 ± 2.18 (0∼22)
After-school class attendance	150 (45.3%)
Sport team	13 (3.9%)
University
Near work (hr/wk)	26.60 ± 19.34 (0∼132)
Outdoor sport (hr/wk)	1.87 ± 3.96 (0∼35)
Indoor sport (hr/wk)	1.34 ± 6.74 (0∼105)
After-school class attendance	20 (6.0%)
Sport team	14 (4.2%)