Table 2. Characteristics of the three cluster groups.

Group	1	2	3	p
Baseline SE (D)	−0.47 ± 2.16	−0.77 ± 2.00	−0.28 ± 1.50	0.0002*
Baseline age (year)	11.45 ± 2.42	10.41 ± 2.08	9.53 ± 1.79	<0.0001
Female (%)	52.67(148/281)	45.10(92/204)	53.29(81/152)	0.1840†
Change of height (mm)	8.60(22.66)	22.14(23.47)	29.75(25.3)	0.3665
Change of weight (kg)	11.54(15.24)	18.66(13.91)	22.02(10.35)	0.4571
Outdoor activity time (hour)	0.89(1.21)	0.97(1.14)	0.95(1.11)	0.8036
Near work time (hour)	4.02(2.30)	4.27(1.91)	4.00(1.86)	0.9565
Paternal refraction (D)	−0.56 ± 2.21	−1.03 ± 1.95	−1.42 ± 2.92	0.0050
Maternal refraction (D)	−0.75 ± 2.21	−1.03 ± 2.35	−2.06 ± 4.00	<0.0001
Two myopic parent (%)	10.23(27/264)	15.90(31/195)	22.67(34/150)	0.003†

Data was showed in form of mean ± sd or median (iqr).

One way ANOVA was used to compare the difference among the three groups unless otherwise noted.

^*Adjusted for baseline age.

^†Chi-square test.