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Table 2.

Twinning rates among brothers and sisters of patients with testicular cancer

Type of deliverySiblings of patients with testicular cancerControlsOR (95% CI)*Born <1990Born in 1990+
Men      
    Singleton (no.) 4,339 5,088 1.00 1.00 1.00 
    Unlike-sex twins 11 23 0.53 (0.26-1.09) 0.61 (0.21-1.80) 0.48 (0.18-1.26) 
    Same-sex twins 33 37 1.00 (0.62-1.60) 1.08 (0.57-2.08) 0.90 (0.45-1.79) 
    Unlike-sex twinning rate (per 1,000 births) 2.5 4.5    
Women      
    Singleton 4,915 5,417 1.00 1.00 1.00 
    Unlike-sex twins 19 14 1.41 (0.70-2.82) 1.55 (0.49-4.90) 1.35 (0.57-3.23) 
    Same-sex twins 50 42 1.27 (0.84-1.92) 1.24 (0.73-2.11) 1.34 (0.69-2.57) 
    Unlike-sex twinning rate (per 1,000 births) 3.8 2.6    
Type of deliverySiblings of patients with testicular cancerControlsOR (95% CI)*Born <1990Born in 1990+
Men      
    Singleton (no.) 4,339 5,088 1.00 1.00 1.00 
    Unlike-sex twins 11 23 0.53 (0.26-1.09) 0.61 (0.21-1.80) 0.48 (0.18-1.26) 
    Same-sex twins 33 37 1.00 (0.62-1.60) 1.08 (0.57-2.08) 0.90 (0.45-1.79) 
    Unlike-sex twinning rate (per 1,000 births) 2.5 4.5    
Women      
    Singleton 4,915 5,417 1.00 1.00 1.00 
    Unlike-sex twins 19 14 1.41 (0.70-2.82) 1.55 (0.49-4.90) 1.35 (0.57-3.23) 
    Same-sex twins 50 42 1.27 (0.84-1.92) 1.24 (0.73-2.11) 1.34 (0.69-2.57) 
    Unlike-sex twinning rate (per 1,000 births) 3.8 2.6    
*

OR adjusted by year of birth (continuous), parental age (continuous), and birth order (1, 2, 3+).

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