Comparison of people screened in round 1, round 2, and both rounds 1 and 2
| Screening results | All people screened in round 1 (n=3489) | All people screened in round 2 (n=4075) | People screened in rounds 1 and 2 (n=2124) | People screened only in round 1 (n=1365) | People screened only in round 2 (n=1951) |
|---|---|---|---|---|---|
| *The proportion of people passing screening in round 1 who were also screened in round 2 was not significantly lower than the proportion passing screening in round 1 who were not screened in round 2. | |||||
| †The proportion of people passing screening in round 2 who were also screened in round 1 was significantly lower than the proportiin passing screening in round 2 who were not screened in round 1 (χ2 = 39.7, df = 2, p<0.0001). | |||||
| ‡Age was missing for 1 patient. | |||||
| §Mean age of patients screened in both rounds was significantly higher than patients screened in round 1 inly (difference = −3.33 years, 95% CI = −4.6 to –2.1, p<0.0001) and patients screened in round 2 only (difference = −9.40 years, 95% CI = −10.4 to −8.4, p<0.0001). | |||||
| Round 1: | |||||
| Passed both eyes | 3308 (94.8%) | 2007 (94.5%)* | 1301 (95.3%)* | ||
| Failed one eye | 91 (2.6%) | 61 (2.9%) | 30 (2.2%) | ||
| Failed both eyes | 90 (2.6%) | 56 (2.6%) | 34 (2.5%) | ||
| Round 2: | |||||
| Passed both eyes | 3884 (95.3%) | 1982 (93.3%)† | 1902 (97.5%)† | ||
| Failed one eye | 107 (2.6%) | 78 (3.7%) | 29 (1.5%) | ||
| Failed both eyes | 84 (2.1%) | 64 (3.0%) | 20 (1.0%) | ||
| Mean age, years (SD) | 34.7 (18.1)‡ | 31.5 (17.60)‡ | 36.0 (18.0)‡§ | 32.6 (18.2)§ | 26.6 15.8)§ |
| Males (%) | 1671 (47.9%)‡ | 1988 (48.8%) | 1028 (48.4%) | 643 (47.1%)‡ | 960 (49.2%) |