Table 1.
Demographic Characteristics of Children With Information Available at Each Research Clinic Visit
| Research Clinic | N | Sex* (Boys/Girls) | Age,† y | Ethnicity(European/non-European) | Refractive Error†(D) | Genetic Risk* Low/High/Missing, No. (%) | Parental myopia*No/Yes/Missing, No. (%) | Time Reading*Low/High/Missing, No. (%) | Time Outdoors* Low/High/Missing,No. (%) |
|---|---|---|---|---|---|---|---|---|---|
| ALSPAC | |||||||||
| Age 7 | 5564 | 2827/2737 | 7.53(6.92 to 8.13) | 5564/0 | 0.20(–1.53 to 1.92) | 2772/2792/0(49.8/50.2/0.0) | 1341/1979/2244(24.1/35.6/40.3) | 2923/1700/941(52.5/30.6/16.9) | 2210/2450/904(39.7/44.0/16.2) |
| Age 10 | 5291 | 2622/2669 | 10.64 (10.15 to 11.13) | 5291/0 | 0.06(–2.06 to 2.19) | 2645/2646/0(50.0/50.0/0.0) | 1269/1898/2124(24.0/35.9/40.1) | 2801/1679/811(52.9/31.7/15.3) | 2142/2376/773(40.5/44.9/14.6) |
| Age 12 | 4839 | 2360/2479 | 12.81 (12.36 to 13.25) | 4839/0 | –0.16(–2.45 to 2.12) | 2423/2416/0(50.1/49.9/0.0) | 1154/1747/1938(23.8/36.1/40.0) | 2554/1544/741(52.8/31.9/15.3) | 1937/2195/707(40.0/45.4/14.6) |
| Age 15 | 3687 | 1745/1942 | 15.43(14.89 to 15.97) | 3687/0 | –0.38(–2.89 to 2.12) | 1850/1837/0(50.2/49.8/0.0) | 886/1387/1414(24.0/37.6/38.4) | 1958/1251/478(53.1/33.9/13.0) | 1449/1779/459(39.3/48.3/12.4) |
| Generation R | |||||||||
| Age 9 | 2395 | 1200/1195 | 9.83(9.82 to 9.85) | 1625/770 | 0.75(0.70 to 0.80) | 718/720/957(30.0/30.0/40.0) | 718/820/857(30.0/34.2/35.8) | 973/599/823(40.6/25.0/34.4) | 995/968/432(41.5/40.4/18.0) |
*
Sample size in each category.
†
Mean (95% CI).