The association between hair dye use and sociodemographic and lifestyle factors in the Dutch general population: a cross-sectional questionnaire-based study

Background: Several sociodemographic and lifestyle factors might influence the use of cosmetic procedures.
Objectives: To investigate the association between (adverse skin reactions to) hair dye use and several sociodemographic and lifestyle factors in the Dutch general population.
Methods: This cross-sectional study used questionnaire-derived data from the population-based Lifelines cohort regarding lifetime hair dye use and adverse skin reactions (n=70,987). Logistic regression analyses were conducted between (adverse skin reactions to) hair dye use and sociodemographic factors (ethnicity, hair colour, marital status, educational attainment, income, neighbourhood socioeconomic status) and lifestyle factors (smoking, alcohol consumption, and body measurement index (BMI)). 
Results: Hair dye use was positively associated with having Mediterranean or Arabic ethnicity, dark blonde or brown hair, a relationship, lower socioeconomic status, smoking, daily alcohol consumption, and higher BMI. Furthermore, adverse skin reactions to hair dye were positively associated with being single, divorced or widowed, higher educational attainment, smoking, and higher BMI.
Conclusions: Our findings highlight several sociodemographic and lifestyle disparities in hair dye use and its adverse skin reactions. Notably, smoking and BMI were consistently associated with both hair dye use and adverse skin reactions, suggesting that they may increase susceptibility to develop adverse reactions to hair dye.
Keywords (3-8): Hair dye, hair colorant, skin reaction, contact allergy, sociodemographic, socioeconomic status, lifestyle, general population