Sexuality and respiratory outcomes in the UK: disparities, development and mediators in multiple longitudinal studies

Limited international research suggests sexual minority individuals, in particular sexual minority women, may experience worse asthma outcomes than their heterosexual peers. We aim to explore if a similar disparity is present in the UK.

Pooled data from five UK longitudinal studies (total N = 84,480, 4723(5.59 %sexual minority) METHODS: We examined risk for asthma and poor lung function by sexuality. To explore the impact of ageing on disparities we compared asthma by sexuality at two time points approximately 10 years apart. To help understand potential causal mechanisms we used respondents aged under 18 as a negative control. Finally, we conducted a mediation analysis to examine the extent to which smoking accounts for asthma disparities.

Sexual minority respondents were more likely to report asthma (RR 1.43 [95 % CI 1.26 to 1.62]) and poor lung function (RR 1.50 [95 % CI 1.20 to 1.87]). Sexual minority women (RR 1.51 [95 % CI 1.30 to 1.76]) and bisexual respondents (RR 1.75 [95 % CI 1.35 to 2.26]) were more likely to report asthma than their heterosexual counterparts. Rates of asthma did not vary by sexuality in <18s and disparities increased between time points in adults supporting the hypothesis that disparities emerge after childhood and widen over the lifecourse. Smoking only partially mediated (proportion mediated 1 %) the relationship between sexual minority status and asthma.

This analysis adds substantially to our understanding of how and when asthma and lung function disparities by sexuality in the UK emerge, as well as evidencing the limited role of smoking.