Table 2.
Incidence rates and hazard ratios for myopia in children with allergic conjunctivitis (AC) compared with children without AC stratified by demographic factors in Cox proportional hazard regression.
| Variables | Non-AC group |
AC group |
aHRa (95% CI) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| N | Event no. | Person-years | IR | N | Event no. | Person-years | IR | ||
| All | 58,747 | 10,474 | 554,903 | 18.9 | 58,747 | 21,285 | 469,537 | 45.3 | 2.35 (2.29–2.40)⁎⁎⁎ |
| Sex | |||||||||
| Girl | 26,133 | 5105 | 238,398 | 21.4 | 26,133 | 9694 | 201,612 | 48.1 | 2.20 (2.13–2.28)⁎⁎⁎ |
| Boy | 32,614 | 5369 | 316,505 | 17.0 | 32,614 | 11,591 | 267,925 | 43.3 | 2.49 (2.41–2.57)⁎⁎⁎ |
| Age, years | |||||||||
| 1–6 | 37,148 | 8420 | 390,335 | 21.6 | 37,148 | 16,401 | 324,226 | 50.6 | 2.30 (2.24–2.36)⁎⁎⁎ |
| 7–12 | 19,641 | 2034 | 157,730 | 12.9 | 19,641 | 4766 | 138,759 | 34.4 | 2.56 (2.43–2.70)⁎⁎⁎ |
| 13–18 | 1958 | 20 | 6838 | 2.92 | 1958 | 118 | 6552 | 18.0 | 6.08 (3.79–9.76)⁎⁎⁎ |
| Urbanization | |||||||||
| Level 1 (highest) | 21,464 | 3690 | 203,245 | 18.2 | 21,464 | 7820 | 170,849 | 45.8 | 2.46 (2.37–2.56)⁎⁎⁎ |
| Level 2 | 18,754 | 3411 | 177,187 | 19.3 | 18,754 | 6788 | 150,290 | 45.2 | 2.30 (2.21–2.40)⁎⁎⁎ |
| Level 3 | 10,935 | 2023 | 102,113 | 19.8 | 10,935 | 3879 | 87,517 | 44.3 | 2.19 (2.07–2.31)⁎⁎⁎ |
| Level 4 (lowest) | 7594 | 1350 | 72,358 | 18.7 | 7594 | 2798 | 60,882 | 46.0 | 2.42 (2.27–2.58)⁎⁎⁎ |
Abbreviation: AC, allergic conjunctivitis; IR, incidence rates, per 1000 person-years; aHR, adjusted hazard ratio; CI, confidence interval.
a
Models mutually adjusted for sex, age (continuous), parents' occupational status, and urbanization.
⁎⁎⁎
p < 0.001.