Table 2 The Lens thickness (mean ± standard deviation) and refractive lens power (mean ± standard deviation) in the Qinghai Children Eye Study, stratified by age, gender and ethnicity.
From: Refractive lens power and lens thickness in children (6–16 years old)
Age (years) | n | Lens thickness (mm) | Refractive lens power (Diopter) | ||||||
|---|---|---|---|---|---|---|---|---|---|
Boys | Girls | Total | P | Boys | Girls | Total | P | ||
6 | 20 | 3.38 ± 0.18 | 3.34 ± 0.13 | 3.36 ± 0.15 | 0.65 | 25.83 ± 1.82 | 27.31 ± 1.19 | 26.42 ± 1.73 | 0.059 |
7 | 51 | 3.31 ± 0.13 | 3.33 ± 0.11 | 3.32 ± 0.12 | 0.46 | 25.21 ± 1.31 | 26.16 ± 1.47 | 25.62 ± 1.45 | 0.02 |
8 | 70 | 3.31 ± 0.14 | 3.36 ± 0.13 | 3.33 ± 0.14 | 0.12 | 25.00 ± 1.51 | 26.35 ± 1.70 | 25.66 ± 1.73 | 0.001 |
9 | 79 | 3.26 ± 0.15 | 3.34 ± 0.15 | 3.30 ± 0.16 | 0.02* | 24.49 ± 1.70 | 26.03 ± 2.16 | 25.37 ± 2.11 | 0.001 |
10 | 65 | 3.31 ± 0.19 | 3.27 ± 0.14 | 3.29 ± 0.17 | 0.35 | 24.57 ± 1.81 | 25.55 ± 1.81 | 25.07 ± 1.86 | 0.03 |
11 | 46 | 3.31 ± 0.15 | 3.29 ± 0.20 | 3.30 ± 0.17 | 0.74 | 24.75 ± 1.33 | 25.28 ± 21.0 | 24.99 ± 1.72 | 0.31 |
12 | 30 | 3.25 ± 0.20 | 3.30 ± 0.14 | 3.28 ± 0.17 | 0.42 | 24.32 ± 2.24 | 24.96 ± 1.89 | 24.66 ± 2.05 | 0.40 |
13 | 76 | 3.21 ± 0.18 | 3.31 ± 0.16 | 3.26 ± 0.18 | 0.02* | 23.29 ± 1.89 | 24.93 ± 2.05 | 24.07 ± 2.12 | 0.001 |
14 | 81 | 3.23 ± 0.16 | 3.31 ± 0.17 | 3.27 ± 0.17 | 0.05 | 23.17 ± 1.51 | 24.81 ± 1.90 | 23.98 ± 1.89 | < 0.001 |
15 | 59 | 3.29 ± 0.17 | 3.31 ± 0.16 | 3.30 ± 0.17 | 0.76 | 23.57 ± 1.51 | 24.83 ± 1.58 | 24.14 ± 1.65 | 0.003 |
16 | 19 | 3.35 ± 0.18 | 3.44 ± 0.20 | 3.38 ± 0.19 | 0.36 | 23.82 ± 1.64 | 25.22 ± 1.53 | 24.26 ± 1.70 | 0.09 |
Total | 596 | 3.28 ± 0.17 | 3.32 ± 0.15 | 3.30 ± 0.16 | 0.005* | 24.24 ± 1.79 | 25.51 ± 1.95 | 24.85 ± 1.98 | < 0.001 |
Ethnicity | |||||||||
Han | 353 | 3.28 ± 0.17 | 3.31 ± 0.16 | 3.29 ± 0.16 | 24.26 ± 1.81 | 25.53 ± 1.96 | 24.88 ± 1.99 | ||
Hui | 183 | 3.28 ± 0.17 | 3.34 ± 0.14 | 3.31 ± 0.16 | 24.21 ± 1.85 | 25.51 ± 1.99 | 24.83 ± 2.02 | ||
Tibetan | 60 | 3.29 ± 0.16 | 3.31 ± 0.17 | 3.30 ± 0.17 | 24.16 ± 1.62 | 25.37 ± 1.80 | 24.74 ± 1.80 | ||
