From: Refractive errors and risk factors for myopia in infants aged 1–18 months in Tianjin, China
Age in months | N | Mean | SD | 95% CI for mean | |
---|---|---|---|---|---|
Lower bound | Upper bound | ||||
1–3 | 140 | 2.74 | 1.74 | 2.45–3.03 | |
3–6 | 143 | 2.02 | 1.39 | 1.79–2.25 | |
6–9 | 156 | 1.26 | 1.28 | 1.05–1.46 | |
9–12 | 73 | 1.27 | 1.23 | 0.95–1.53 | |
12–18 | 71 | 1.35 | 1.44 | 1.01–1.69 | |
Total | 583 | 1.81 | 1.56 | 1.68–1.94 | |
P | <0.001 | ||||
Boys | |||||
312 | 1.91 | 1.60 | 1.73–2.10 | ||
1–3 | 77 | 2.87 | 1.93 | 2.45–3.30 | |
3–6 | 78 | 2.10 | 1.29 | 1.79–2.38 | |
6–9 | 76 | 1.30 | 1.19 | 1.02–1.59 | |
9–12 | 46 | 1.37 | 1.33 | 1.03–1.77 | |
12–18 | 35 | 1.42 | 1.51 | 0.89–1.97 | |
Girls | |||||
271 | 1.69 | 1.52 | 1.52–1.87 | ||
1–3 | 63 | 2.58 | 1.50 | 2.19–2.93 | |
3–6 | 65 | 1.93 | 1.51 | 1.58–2.29 | |
6–9 | 80 | 1.22 | 1.37 | 0.94–1.54 | |
9–12 | 27 | 1.04 | 1.04 | 0.63–1.45 | |
12–18 | 36 | 1.28 | 1.38 | 0.84–1.75 | |
P | 0.104 |