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To investigate the relationship of neck circumference (NC) to metabolic syndrome (MetS) and obstructive sleep apnea syndrome (OSAS) and whether it adds information to that provided by waist circumference.

Cross-sectional analysis of a population sample of 1912 men and women, aged 55.1 ±12 years, representative of Turkish adults. MetS was identified based on modified criteria of the ATP-III, OSAS when habitual snoring and episodes of apnea were combined with another relevant symptom.

NC measured 36.7 (±3.5) cm in the total sample. It was significantly correlated with numerous risk factors, above all body mass index and waist girth (r≥0.6), homeostatic model-assessed insulin resistance, blood pressure and, inversely, with smoking status and sex hormone-binding globulin. Sex- and age-adjusted NC was associated significantly with MetS, at a 2–3-fold …