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Ann Epidemiol. 2015 Oct;25(10):779-84.e1. doi: 10.1016/j.annepidem.2015.07.004. Epub 2015 Aug 6.

Menopausal hormone therapy and sleep-disordered breathing: evidence for a healthy user bias.

Author information

  • 1Department of Population Health Sciences, University of Wisconsin-Madison, Madison. Electronic address: amirer@wisc.edu.
  • 2Department of Population Health Sciences, University of Wisconsin-Madison, Madison.
  • 3Department of Psychiatry, University of Wisconsin, Madison.

Abstract

PURPOSE:

Observational studies suggest that menopausal hormone therapy protects against sleep-disordered breathing, but such findings may be biased by a "healthy user effect." When the Women's Health Initiative Study reported in 2002 that estrogen-progestin therapy increases heart disease risk, many women discontinued hormone therapy. We investigate healthy user bias in the association of hormone therapy with sleep-disordered breathing in the Sleep in Midlife Women Study.

METHODS:

A total of 228 women aged 38 to 62 years were recruited from the Wisconsin Sleep Cohort Study. They underwent polysomnography to measure apnea-hypopnea index, at home semiannually from 1997 to 2006, and in the sleep laboratory every four years (n = 1828 studies). Hormone therapy was recorded monthly. Linear models with empirical standard errors regressed logarithm of apnea-hypopnea index on hormone use with a pre- or post-July 2002 interaction, adjusting for menopause and age.

RESULTS:

The association of hormone therapy and sleep-disordered breathing was heterogeneous (P < .01); apnea-hypopnea index among users was 15% lower in the early period (95% confidence interval, -27% to -1%), but similar to nonusers in the late.

CONCLUSIONS:

Hormone therapy was negatively associated with sleep-disordered breathing only until the Women's Health Initiative results were publicized. Hormone therapy may have been a marker for healthfulness in the early period, creating a spurious association with sleep-disordered breathing.

KEYWORDS:

Bias (epidemiology); Estrogen replacement therapy; Menopause; Obstructive; Sleep apnea; Sleep apnea syndromes; Women's health

PMID:
26358364
DOI:
10.1016/j.annepidem.2015.07.004
[PubMed - indexed for MEDLINE]
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