title: Inter-observer reliability of candidate predictive morphometric measurements for women with suspected obstructive sleep apnea.
abstract: OBJECTIVE
  Obstructive sleep apnea (OSA) is increasingly recognized as a public health concern. Definitive diagnosis is by overnight polysomnographic (PSG) examination. Identification of clinical predictors would be beneficial in helping prioritize high-risk patients for assessment. Practical application of morphometric predictive variables would require a high level of reproducibility in a clinical setting. In this study, our objective was to evaluate reliability between observers in measurements of candidate morphometric parameters in women.
  
  
  METHODS
  This was a prospective study of 71 women who had been referred for PSG with suspected OSA. Selected morphometric parameters were measured independently in the sleep laboratory by two trained sleep physicians.
  
  
  RESULTS
  Neck circumference and truncal measurements for lower costal, midabdominal, and hip circumferences had higher reliability coefficients (intraclass correlation coefficients [ICC] of 0.78, 0.95, 0.95, and 0.81) than the smaller dimension measurements, including cricomental distance or retrognathia (ICC of 0.04 and 0.17). Of the women participating in this study, 50 of 71 had apnea-hypopnea indexes (AHI) ≥ 5. Body mass index (BMI), neck circumference, lower costal girth, midabdominal girth, and hip girth were all significantly higher (p < 0.001-0.004) in women with AHI ≥ 5.
  
  
  CONCLUSIONS
  There was wide variation in inter-observer reliability for different physical dimensions. We propose that any clinical morphologic measurement employed in predictive modeling should be reliably reproducible in clinical setting conditions. Our findings support the use of several truncal measures, BMI, and neck circumference as predictive measures in women undergoing evaluation for OSA.
authors.affiliation: Division of Respiratory, Critical Care and Sleep Medicine, Saskatoon, Saskatchewan, Canada. john.gjevre@usask.ca
authors.forename: John A
authors.initials: JA
authors.lastname: Gjevre
authors.forename: Regina M
authors.initials: RM
authors.lastname: Taylor-Gjevre
authors.forename: John K
authors.initials: JK
authors.lastname: Reid
authors.forename: Robert
authors.initials: R
authors.lastname: Skomro
authors.forename: David
authors.initials: D
authors.lastname: Cotton
mesh_terms: D015992:Body Mass Index; D001837:Body Weights and Measures / Q000379:methods* / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D015588:Observer Variation; D017286:Polysomnography / Q000379:methods; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012372:ROC Curve; D015203:Reproducibility of Results; D012307:Risk Factors; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis*
keywords: Women; body measures; sleep