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We calculated the odds ratios (OR) and 95% confidence intervals (95% CI) associated with various measures of betaPV infection using multivariable logistic regression analysis in SPSS software version 16 for Windows. Our approach was to fit minimally adjusted models. Potential confounding variables that did not alter the odds ratio or significantly improve the fit of the model were not included. Given the exploratory nature of our study, and given that we were not testing the ��universal null hypothesis��, we followed the advice of Rothman (54) and Savitz & Olshan (55) in electing not to perform http://www.selleckchem.com/products/byl719.html adjustment for multiple testing. We categorized participants according to whether or not betaPV DNA for any of 25 viruses was detected in plucked hairs and then according to the number of betaPV types detected. Similarly, participants were categorized depending on whether or not antibodies to any of 15 betaPV were detected and on the number of viruses to which antibodies were detected. We defined a new variable ��concordant measures of infection�� by classifying participants according to whether or not they were both antibody and DNA positive for the same betaPV type. We performed type-specific analyses, and also created http://www.selleckchem.com/products/SB-431542.html a summary concordance variable in which we classified participants into ��antibody negative, irrespective of DNA status��, ��antibody positive but with no types for which DNA was also found�� and ��antibody positive with at least one type concordant for DNA��. Types of transplants were grouped into ��renal�� and ��other��, which included heart, combined kidney�Cpancreas, kidney�Cliver, and kidney�Cheart. We did not include lung, liver or pancreas only transplant recipients because the participating centers had limited access to these patients. Skin phototype was classified http://www.selleck.cn/products/ipi-145-ink1197.html as ��olive�� and ��medium/fair�� based on questions about tanning ability, sun reactivity and Fitzpatrick skin type (50). The number of hours of work and recreational sun exposure were grouped into low (0�C3 hours/day) and high (4 or more hours/day) exposure. A total of 210 OTR with a history of SCC and 394 controls without skin cancer were recruited. The majority (83%) were renal allograft recipients and there were more men (73%). We experienced some difficulty in matching by age and time since transplantation, so younger controls were recruited in some cases. The cases were older at time of investigation (p?