This is the first research to examine the relation of ultraviolet (UV) sunlight and personality to cancer incidence employing the same database. Two nomothetic studies focused on 2000–2010 and employed the 50 American states as analytical units. Both used state UV levels determined from National Weather Service data, state cancer incidence data from the Centers for Disease Control and Prevention, and state Big Five personality scores based on the responses of 619,397 state residents to an online survey published by Rentfrow and his colleagues in 2008. Both studies controlled for state socioeconomic status, urbanization, and a composite of four common cancer risk factors. Both used multiple regression strategies. Study 1 found that state UV levels related negatively to total invasive cancer incidence but showed equivocal results in relation to White skin cancer incidence. State resident neuroticism scores were positively related to total invasive cancer incidence but unrelated to White skin cancer incidence, which was associated with high agreeableness and low extraversion. Study 2 used the state incidence of 25 leading cancers as separate criteria. UV levels independently predicted the state incidence of 12 cancer types, while neuroticism independently predicted the incidence of 10 types. As well, 32 interactions were found between UV levels and personality regarding the incidence of 19 cancer types. For nine independent interactions found with the maximum number of statistical controls—five involving neuroticism, three agreeableness, and one conscientiousness—personality differences in cancer incidence were quite pronounced under low UV conditions but negligible under high UV conditions.

这是使用同一数据库检查紫外线（UV）和性格与癌症发病率之间关系的第一项研究。两项侧重于2000-2010年的非正则研究使用了美国的50个州作为分析单位。两者都使用了根据国家气象局数据确定的州紫外线水平，疾病控制与预防中心的州癌症发病率数据以及州六大个人格得分，这些得分基于619,397位州居民对Rentfrow及其同事发表的在线调查的回应2008年。两项研究均控制了州的社会经济状况，城市化程度以及四种常见癌症风险因素的综合影响。两者都使用了多种回归策略。研究1发现状态UV含量负相关总浸润性癌症发病率相对于白人皮肤癌发病率显示出模棱两可的结果。州居民神经质评分与总浸润性癌症发生率呈正相关，但不相关与白皮肤癌的发病率有关，这与高认同感和低外向性有关。研究2使用25种主要癌症的州发病率作为单独的标准。紫外线水平独立地预测了12种癌症的状态发生率，而神经质独立地预测了10种癌症的发生率。同样，关于19种癌症的发生率，在紫外线水平和性格之间发现了32种相互作用。对于统计控制最多的九种独立相互作用，其中五种涉及神经质，三项令人满意，一种尽责，在低紫外线条件下癌症发病率的人格差异非常明显，而在高紫外线条件下则可以忽略不计。