Table 1 Basic information of enrolled participants.

From: The rate of orthokeratology lens use and associated factors in 33,280 children and adolescents with myopia: a cross-sectional study from Shanghai

Age, years

Total population, n

Potential population, na

Ortho-k lens wearers, n

Wearing rate in total population, %b

Wearing rate in potential population, %c

6d

4558

290

1

0.0

0.3

7

6059

963

10

0.2

1.0

8

5534

1376

46

0.8

3.2

9

5245

1882

85

1.6

4.3

10

4796

2127

131

2.7

5.8

11

6752

3516

131

1.9

3.6

12

6818

3829

154

2.3

3.9

13

5424

3149

126

2.3

3.9

14

4827

2765

79

1.6

2.8

15

7384

4079

115

1.6

2.7

16

7502

4074

77

1.0

1.9

17

6780

3583

60

0.9

1.7

18e

1241

626

6

0.5

1.0

Total

72,920

32,259

1021

1.4

3.1

  1. aThe potential population of ortho-k lens use was defined as −5.0 D ≤ SE ≤ − 1.0 D and a cylindrical degree of ≤2.0 D for non-users.
  2. bWearing rate in the total population = \(\frac{{{{{{{{{\mathrm{Ortho - k}}}}}}}}\;{{{{{{{\mathrm{lens}}}}}}}}\;{{{{{{{\mathrm{wearers}}}}}}}}}}{{{{{{{{{\mathrm{Total}}}}}}}}\;{{{{{{{\mathrm{population}}}}}}}}}}\) × 100%
  3. cWearing rate in the potential population = \(\frac{{{{{{{{{\mathrm{Ortho - k}}}}}}}}\;{{{{{{{\mathrm{lens}}}}}}}}\;{{{{{{{\mathrm{wearers}}}}}}}}}}{{{{{{{{{\mathrm{Ortho - k}}}}}}}}\;{{{{{{{\mathrm{lens}}}}}}}}\;{{{{{{{\mathrm{wearers + Potential}}}}}}}}\;{{{{{{{\mathrm{population}}}}}}}}}}\) × 100%
  4. dA total of 4 5-year-old were included in the 6-year-old age group, in which there were no ortho-k lens users.
  5. eA total of 161 19-year-olds and 13 20-year-olds were included in the 18-year-old age group, in which there were no ortho-k lens users.
Back to article page