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. Author manuscript; available in PMC: 2021 Nov 1.
Published in final edited form as: Environ Int. 2021 Jul 2;156:106715. doi: 10.1016/j.envint.2021.106715

Fig. 2.

Fig. 2.

Associations of PM2.5, NO2 and ozone with cardiovascular disease (CVD), coronary heart disease (CHD) and cerebrovascular disease (CBV) hospitalization in stratified analyses by tertiles of NDVI, summer temperature (summer temp), winter temperature (winter temp), summer specific humidity (summer humidity) and winter specific humidity (winter humidity) a, b. a Associations are expressed per IQR increase (IQR PM2.5 = 4.0 μg/m3, IQR NO2 = 13.9 ppb, IQR Ozone = 4.4 ppb) of the cardiovascular disease hospitalization cohort. Models included PM2.5, NO2 and ozone and were adjusted for calendar year, US census covariates, BRFSS covariates, US regions, an offset for total person-time and strata for all possible combinations of sex, race, Medicaid Eligibility, age at study entry (2-year categories), and follow-up year. b To define strata, we used the following quantiles (q33.3, q66.7) for the CVD cohort: summer temp (°C): 28.2, 31.7; winter temp (°C): 4.8, 13.1; summer humidity (g of water vapor / kg of dry air): 10.9, 13.4; winter humidity (g of water vapor / kg of dry air): 2.7, 4.1; NDVI: 0.41, 0.60. For the CHD cohort: summer temp (°C): 28.2, 31.7; winter temp (°C): 4.8, 13.1; summer humidity (g of water vapor / kg of dry air): 11.0, 13.4; winter humidity (g of water vapor / kg of dry air): 2.7, 4.1; NDVI: 0.42, 0.60. For the CBV cohort: summer temp (°C): 28.2, 31.7; winter temp (°C): 4.8, 13.1; summer humidity (g of water vapor / kg of dry air): 11.0, 13.4, winter humidity (g of water vapor / kg of dry air): 2.7, 4.1; NDVI: 0.42, 0.60.