an increasing trendp =< 0.01
An association was found between high paternal exposure to crystalline silica and ALL (OR: 2.20, 95% CI 1.60–3.01), with an increasing trend from no exposure to high exposure ( p =< 0.01) to LMA (OR: 2.03, 95% CI: 1.04–3.97; P for trend: 0.008).