. 2023 Mar 21;11:1137196. doi: 10.3389/fpubh.2023.1137196

Table 2.

Association between air pollution and all-cause hospitalization risk.

	Single O₃ model	Single PM₁₀ model	Two-pollutant model
	Single O₃ model	Single PM₁₀ model	O ₃	PM ₁₀
	HR (95% CI)	HR (95% CI)	HR (95% CI)	HR (95% CI)
Model 1	1.081 (1.067,1.095)	1.023 (1.005,1.041)	1.081 (1.067,1.094)	1.022 (1.004,1.040)
Model 2	1.071 (1.058,1.085)	1.033 (1.015,1.051)	1.070 (1.056,1.083)	1.030 (1.012,1.048)
Model 3	1.071 (1.057,1.085)	1.033 (1.015,1.051)	1.070 (1.056,1.083)	1.030 (1.012,1.048)
Model 4	1.069 (1.056,1.083)	1.034 (1.016,1.052)	1.068 (1.055,1.082)	1.031 (1.013,1.049)

Model 1: crude two-pollutant model; Model 2: adjusted by basic demographics; Model 3: Model 2 + lifestyle information and BMI; Model 4: Model 3 + other preexisting health conditions.