Relation of daily mortality to air pollution: an analysis of 14 London winters, 1958/59-1971/72.
The relationship between daily deaths and daily concentrations of Smoke and SO2 in London, England for 14 winters during the years 1958-1959 through 1971-1972 has been explored. Three types of analyses were used: (1) year-by-year multiple regression; (2) stratification using nested quartiles of one pollutant within quartiles of the other; and (3) multiple regression of a special subset of high pollution days. An association was found with Smoke, but not with SO2. Whether a linear model with zero threshold or a threshold model best fits could not be determined unambiguously because of a statistical artifact. Reasons for preferring a threshold-type quadratic model are given.
D000393:Air Pollutants / Q000009:adverse effects* / Q000032:analysis; D006801:Humans; D008131:London; D009026:Mortality; D012044:Regression Analysis; D012621:Seasons; D012906:Smoke / Q000032:analysis; D013458:Sulfur Dioxide / Q000032:analysis; D013997:Time Factors
D000393:Air Pollutants; D012906:Smoke; D013458:Sulfur Dioxide