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To the Editor I read with interest the cross-sectional study by Namtvedt et al 1 for 77 adults who were sampled from 30 000 individuals aged 30–65 years. They concluded that there was a significant positive association between obstructive sleep apnoea (OSA) and endothelial dysfunction by using indicators of apnoea–hypopnoea index (AHI), flow-mediated dilatation (FMD), sex and some cardiovascular risk factors. Atkinson made a query on the validity of FMD on their study,2 and I present some statistical concerns …
Contributors I have read this correspondence, contributed to it and approved its submission to Heart.
Competing interests The author has indicated no financial support, and there is no conflict of interest in this study.
Provenance and peer review Not commissioned; internally peer reviewed.