Table 1

Age, levels of education, type of occupation and smoking habits among 16 209 middle aged Oslo men according to five years average nitrogen oxides (NOx) exposure at their home addresses, 1974 to 1978

NOx exposure (μg/m3)
N0–9.99 (n = 6474)10–19.99 (n = 4479)20–29.99 (n = 3082)30+ (n = 1931)
Missing information: NOx, 243; education, 36; occupation, 148.
Total 15 96640.5%28.1%19.3%12.1%
Age
40 to 45 years730841.5%27.4%17.7%13.4%
46 to 49 years865839.7%28.6%20.7%11.0%
Education
<10 years476139.1%28.1%22.8%9.9%
10 to 12 years772642.5%27.4%17.8%12.3%
12+ years344338.3%29.4%17.7%14.6%
Occupation
“Blue collar”
Moderate physical work467841.6%27.8%17.8%12.7%
Intermediate physical work273640.6%27.7%20.0%11.8%
Vigorous physical work59238.8%29.3%20.8%11.1%
“White collar”781237.5%29.9%22.0%10.6%
Smoking habits
Non-smoker303142.0%28.7%17.2%12.2%
1–9 cigarettes per day154342.1%26.9%19.4%11.6%
10–19 cigarettes per day436139.0%28.0%21.4%11.5%
20+ cigarettes per day300737.0%28.2%21.9%12.9%
Smoker, amount not reported7544.0%28.0%9.3%18.7%
Former smoker394943.2%28.0%16.7%12.1%