Fig. 2From: Incidence of osteoporosis and ambient air pollution in South Korea: a population-based retrospective cohort studyAdjusted sub-hazard ratios (HRs) and 95% confidence interval (CI) for osteoporosis incidence according to the quartile of PM10. HRs and 95% CI were obtained by the Cox-proportional hazard model after adjusting for age, sex, insurance level, urbanization, and comorbidities (selective stratification variable was not included in the model)Back to article page