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Table 3 The relations between sperm count and semen lead concentrations after adjusted age, body-mass index and smoking by multiple linear regressions (N=341)

From: Lead level in seminal plasma may affect semen quality for men without occupational exposure to lead

Variables Beta coefficients± SE (standard error) P
Age (Y/O) 1.1±0.7 0.1433
Body mass index(kg/m2) 0.4±2.3 0.8514
Smoking −0.2±5.6 0.9699
Semen lead −4.44±1.87 0.0181