Figure 1. Sensitivity and stratified analyses of the association between PM2.5 exposure and total non-accidental mortality in 100 Japanese cities, April 2012 to March 2015 CI, confidence interval; ICD, international classification of diseases; NO2, nitrogen dioxide; Ox, photochemical oxidants; PM, particulate matter; SO2, sulphur dioxide aAdjusted for PM2.5 at lag2 and lag3, ambient temperature at lag0-1, relative humidity at lag0-1, and influenza epidemics. bThe sum of the region was 99, because we did not include Naha, Okinawa, in West Japan due to geographical differences (see eTable 1).
