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Table 1.

Select population characteristics of bladder cancer cases and controls in the HPFS and NHS

VariableHPFS
NHS
Cases, n = 123Controls, n = 125P valueCases, n = 61Controls, n = 67P value
Age at blood draw*, mean (SD) 66.9 (8.1) 66.7 (8.0) 0.90 58.5 (7.3) 59.1 (6.9) 0.63 
BMI at blood draw, mean (SD) 26.0 (3.0) 25.3 (3.2) 0.10 20.8 (10.7) 24.7 (8.2) 0.02 
Relative telomere length, mean (SD) 0.19 (0.14) 0.23 (0.13) 0.01 0.31 (0.17) 0.36 (0.14) 0.06 
Relative telomere length, median 0.16 0.23  0.30 0.35  
Pack-years of smoking, mean (SD) 35.0 (24.6) 26.5 (19.5) 0.02 29.7 (21.9) 27.8 (21.8) 0.70 
VariableHPFS
NHS
Cases, n = 123Controls, n = 125P valueCases, n = 61Controls, n = 67P value
Age at blood draw*, mean (SD) 66.9 (8.1) 66.7 (8.0) 0.90 58.5 (7.3) 59.1 (6.9) 0.63 
BMI at blood draw, mean (SD) 26.0 (3.0) 25.3 (3.2) 0.10 20.8 (10.7) 24.7 (8.2) 0.02 
Relative telomere length, mean (SD) 0.19 (0.14) 0.23 (0.13) 0.01 0.31 (0.17) 0.36 (0.14) 0.06 
Relative telomere length, median 0.16 0.23  0.30 0.35  
Pack-years of smoking, mean (SD) 35.0 (24.6) 26.5 (19.5) 0.02 29.7 (21.9) 27.8 (21.8) 0.70 
*

Age at blood draw was a matching factor.

P value obtained from Wilcoxon rank sum test.

Among cigarette smokers only.

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