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Fig. 3 | Environmental Health

Fig. 3

From: Air pollution, methane super-emitters, and oil and gas wells in Northern California: the relationship with migraine headache prevalence and exacerbation

Fig. 3

Association between environmental exposures and severity of migraine case status. Associations estimated with mixed logistic and negative binomial models with random intercepts for county adjusted for individual-level age category (18–29, 30–44, 45–54, 55–64, ≥65), race/ethnicity (Hispanic, non-Hispanic Asian, non-Hispanic-Black, non-Hispanic White, and non-Hispanic other), sex, Medicaid use, number of primary care visits per person-year during the study period, and block group-level population density and poverty. Neurology visits, urgent care migraine-specific visits, and triptan prescriptions were parameterized as continuous counts per person-year and analyzed using negative binomial models (Panel a). ED migraine visits were dichotomized as zero vs. ≥ 1 during the study period, and MPA score as > 100 versus less (Panel b). ORs and RRs are per 5 μg/m3 for PM2.5, per 5 ppb for NO2, per 100,000 kg/hour increase in IDW sum of methane emissions within 10 km for super-emitters, and per 1000-unit increase in IDW sum of all wells within 10 km for active oil and gas wells

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Environmental Health

ISSN: 1476-069X