Table 4

 Childhood acute leukaemia and duration of exposure to a close neighbouring petrol station or repair garage during childhood

Cases (n = 280)Controls (n = 285)OR(95% CI)
No.%No.%
Exposure duration to neighbouring petrol station or repair garage
    025791.826894.01.0(ref.)
    1–35 months82.941.43.4(0.9 to 12.4)
    ⩾36 months93.231.14.7(1.2 to 18.5)
Missing values62.1103.5
OR per month of exposure1.03(1.01 to 1.05)
(p trend <0.05)