Table 1 Baseline profile of participants
Characteristics | Intervention group | Control group | P Value |
|---|---|---|---|
(n = 1735) | (n = 1316) | ||
Gender (%) | Â | Â | 0.297 |
Male | 874(50.4) | 688(52.3) | Â |
Female | 861(49.6) | 628(47.7) | Â |
Mean age ± SD (yrs) | 10.09 ± 2.35 | 10.25 ± 2.33 | 0.060 |
Nationality (%) | Â | Â | 0.272 |
Han nationality | 1459(84.1) | 1087(82.6) | Â |
Others | 276(15.9) | 229(17.4) | Â |
Region of habitation (%) | Â | Â | 0.373 |
Rural | 863(49.7) | 676(51.4) | Â |
Urban | 872(50.3) | 640(48.6) | Â |
Mean baseline UCVA ± SD | 4.88 ± 0.20 | 4.88 ± 0.22 | 0.713 |
Suspected myopia (%) | Â | Â | 0.195 |
Yes | 410(31.2) | 579(33.4) | Â |
No | 906(68.8) | 1156(66.6) | Â |
Myopic parents(%) | Â | Â | <0.001 |
Yes | 525(30.3) | 318(24.2) | Â |
No | 1210(69.7) | 998(75.8) | Â |
Paternal education(%) | Â | Â | < 0.001 |
Primary school or less | 194(11.2) | 154(11.7) | Â |
Junior middle school | 788(45.4) | 724(55.0) | Â |
Senior middle school | 472(27.2) | 327(24.8) | Â |
College or above | 281(16.2) | 111(8.4) | Â |
Maternal education(%) | Â | Â | < 0.001 |
Primary school or less | 225(13.0) | 226(17.2) | Â |
Junior middle school | 826(47.6) | 702(53.3) | Â |
Senior middle school | 432(24.9) | 276(21.0) | Â |
College or above | 252(14.5) | 112(8.5) | Â |
Family income per person (%) | Â | Â | < 0.001 |
< 2000 RMB | 268(15.4) | 264(20.1) | Â |
2000-3999RMB | 646(37.2) | 592(45.0) | Â |
4000-5999RMB | 534(30.8) | 358(27.2) | Â |
6000-9999 RMB | 238(13.7) | 88(6.7) | Â |
10000+ RMB | 49(2.8) | 14(1.1) | Â |
Daily screen time* | 1.94 ± 1.70 | 1.83 ± 1.43 | 0.067 |
Daily study duration* | 1.50 ± 1.25 | 1.59 ± 1.50 | 0.058 |
Daily outdoor activity time* | 1.20 ± 1.69 | 1.18 ± 1.55 | 0.723 |