Table 6. Risk of appendicitis during various reference time intervals associated with increases in the interquartile range of PM₁₀ in the two-pollutant models

Lag	Single mollutant	Two pollutant models
	PM10	Adjusted SO2	Adjusted NO2	Adjusted CO	Adjusted O3
0–1	1.027 (0.994–1.060)	1.033 (0.995–1.071)	1.005 (0.970–1.042)	1.017 (0.979–1.056)	1.017 (0.979–1.056)
0–2	1.037 (1.002–1.074)	1.041 (1.001–1.082)	1.009 (0.971–1.049)	1.029 (0.988–1.071)	1.029 (0.988–1.071)
0–3	1.045 (1.007–1.084)	1.049 (1.005–1.094)	1.011 (0.970–1.054)	1.035 (0.991–1.081)	1.035 (0.991–1.081)
0–4	1.051 (1.012–1.091)	1.049 (1.005–1.095)	1.018 (0.976–1.061)	1.043 (0.999–1.090)	1.043 (0.999–1.090)
0–5	1.061 (1.019–1.104)	1.058 (1.011–1.108)	1.030 (0.985–1.077)	1.059 (1.011–1.109)	1.059 (1.011–1.109)
0–6	1.064 (1.020–1.110)	1.060 (1.010–1.113)	1.039 (0.991–1.089)	1.067 (1.016–1.120)	1.067 (1.016–1.120)
0–7	1.053 (1.005–1.103)	1.044 (0.990–1.101)	1.032 (0.980–1.086)	1.064 (1.008–1.123)	1.064 (1.008–1.123)
0–8	1.042 (0.992–1.096)	1.029 (0.971–1.090)	1.026 (0.970–1.085)	1.066 (1.006–1.129)	1.066 (1.006–1.129)
0–9	1.042 (0.987–1.099)	1.027 (0.965–1.093)	1.032 (0.972–1.096)	1.077 (1.012–1.147)	1.077 (1.012–1.147)
0–10	1.031 (0.974–1.092)	1.002 (0.938–1.072)	1.020 (0.956–1.088)	1.062 (0.993–1.136)	1.062 (0.993–1.136)
0–11	1.017 (0.956–1.081)	0.995 (0.926–1.069)	1.012 (0.945–1.085)	1.055 (0.981–1.134)	1.055 (0.981–1.134)
0–12	0.988 (0.926–1.054)	0.962 (0.891–1.038)	0.986 (0.916–1.062)	1.029 (0.952–1.111)	1.029 (0.952–1.111)
0–13	0.966 (0.902–1.035)	0.941 (0.868–1.020)	0.975 (0.901–1.055)	1.017 (0.937–1.105)	1.017 (0.937–1.105)
0–14	0.938 (0.871–1.009)	0.913 (0.837–0.996)	0.960 (0.882–1.044)	1.003 (0.918–1.096)	1.003 (0.918–1.096)

All models were adjusted for daily mean temperature and humidity.
PM₁₀, particulate matter ≤10 μm in diameter; SO₂, sulfur dioxide; NO₂, nitrogen dioxide; CO, carbon monoxide; O₃, ozone.