Table 4

Comparisons of AMD incidences and HRs among four levels of air pollutants

n of AMDPerson- yearsIRIRRAdj. HR95% CIP valueP value for trend
 Lowest: Q1287112,12425.601.001.00<0.001
 Second: Q2314104,05930.
 Third: Q3332114,43129.
 Highest: Q450698,21451.522.011.911.642.23<0.001
 Lowest: Q1297102,79628.891.001.00<0.001
 Second: Q2244109,76822.230.770.740.630.880.001
 Third: Q3373123,58630.
 Highest: Q452192,63456.241.951.841.572.15<0.001
  • Adj. HR, adjusted HR of a multivariate analysis, after adjustment for age, sex, insurance fee, urbanization, alcoholism, ischemic heart disease, chronic obstructive pulmonary disease , diabetes mellitus, hyperlipidemia, and hypertension; AMD, age-related macular degeneration; CO, carbon monoxide; IR, incidence rate (per 10,000 person-years); IRR, incidence rate ratio; n of AMD, numbers of newly diagnosed patients with AMD; NO2, nitrogen dioxide.