A recent study suggests that waist and neck measures correlate better than body mass index (BMI) with select disease severity (lowest oxygen saturation rate [SaO2 nadir] and apnea-hypopnea index [AHI]) in obstructive sleep apnea (OSA) subjects. However, no other significant waist or neck correlations emerged. Therefore, these findings offer an easily measured, ancillary means to assess OSA risk. Researchers studied 59 OSA subjects [age, 48.8 ± 10.0 years; BMI, 31.9 ± 6.6 kg/m2; AHI, 38.5 ± 23.0 events/hour; sleep-efficiency index (SEI, n=52), 78.6 ± 14.4%; SaO2 nadir, 79.5 ± 8.0%; systolic blood pressure (BP), 127.4 ± 15.7 mmHg; diastolic BP, 80.1 ± 9.1 mmHg; 43 male], and determined waist and neck circumferences, daytime sleepiness, sleep quality, depression levels, and anxiety levels. They found:
- BMI, and waist and neck circumferences were significantly correlated with SaO2 nadir (BMI; r = − 0.423; waist; r = − 0.457; neck; r = − 0.263), AHI (BMI; r = 0.349; waist; r = 0.459; neck; r = 0.276), and systolic BP (BMI; r = 0.354; waist; r = 0.321; neck; r = 0.388).
- SEI was significantly correlated with waist circumference (r = 0.28), but higher with BMI (r = 0.291).
Tom C, Roy B, Vig R, et al. Correlations between waist and neck circumferences and obstructive sleep apnea characteristics. Sleep Vigil. 2018;2:111. doi:10.1007/s41782-018-0041-1.