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One widely reported Harvard University study published in 2015 echoed these findings

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in 1989 by the Johns Hopkins School of Public Health 32,000 volunteers gave blood samples, social and medical histories Follow-up questionnaires sent in 1996, 1998, 2000, 2003, 2007 2007 questionnaire collected information on hours spent outdoors, tanning salon use, history of sunburning, and sun protection practices Source: www.jhsph.edu/comstockcenter Materials/Methods: study design Case-control study Over 8,000 subjects responded to the 2007 questionnaire Identified 103 confirmed cases of malignant melanoma who fulfilled our inclusion and exclusion criteria Matching criteria Each case matched to two controls along the following variables Race Age ( 5 years) Sex Skin type Statistics: Chi-square and logistic regression analysis Study Design Inclusion criteria Cases: confirmed history of melanoma (Maryland tumor registry) Controls: no history of melanoma Exclusion criteria: Cases with a history of another cancer diagnosed before melanoma Controls with history of melanoma or confirmed history of any other cancer Anyone missing matching data Methods: skin typedetermination If you went into the sun at noon for 1 hour in the summer Methods: determiningnumber of blistering sunburns How many blistering sunburns have you had in a lifetime: None 1 or 2 3 or 4 5-9 10+ Methods: determining UV exposure history On a typical weekday/weekend in the summerhow many hours (w/o sun protection) in the midday sun