Assessing Environmental, Nutritional, and Genetic Factors for Otitis Media-Related Hearing Loss in Rural Alaska Native Children.

The study was significantly underpowered and compromised by the COVID-19 pandemic, which forced the cancellation of 6-month follow-up visits for many participants and altered recruitment strategies. Selection bias is a major concern; parents of children with active ear infections may have been more or less likely to participate depending on their health-seeking behavior and smoking status, potentially creating the counterintuitive protective effect of smoke exposure. The definition of hearing loss relied on DPOAE and tympanometry, which screen for cochlear function and middle ear status but do not provide a full audiogram or distinguish between sensorineural and conductive loss types. Environmental exposures were assessed via caregiver recall over a two-week period, which is subject to measurement error and social desirability bias, particularly regarding smoking habits. The sample size of 236 children was smaller than the planned 444 observations, limiting the precision of the estimates for genetic and environmental interactions.

The study was supported by the National Institutes of Health (NIDCD R21DC018399) and training grants. The authors declared no conflicts of interest.

Do not interpret the counterintuitive finding that household smoking was associated with lower hearing loss as protective. The authors state this is likely due to selection bias introduced by pandemic-era health-seeking behaviors, where nonsmoking parents may have been more likely to bring symptomatic children for screening.