Table 3.

Subjective Assessment Measures for Obstructive Sleep Apnea and Restless Leg Syndrome

Measure	Purpose	Number of items	Score Interpretation & Psychometrics	Additional Information
Obstructive sleep apnea
Berlin Questionnaire38	To screen patients for OSA	10-items in addition to BMI and history of hypertension	Items fall into three categories: snoring and witnessed apnea, daytime fatigue and sleepiness, and history of hypertension and/or obesity High risk for OSA if two or more categories are considered high risk Being at high risk predicted an AHI > 5 with a sensitivity of 86% and specificity of 77% Internal consistency: Cronbach α ranges from 0.86 to 0.92	Time to complete: 5 minutes Use with permission from the American College of Physicians
OSA5039	To screen patients for OSA	4 items: waist circumference, snoring, witnessed apneas, and age	Score of ≥ 5 predicts the probability of OSA Score of ≥ 5 has a sensitivity of 88% and specificity of 61% for predicting OSA	Time to complete: 5 minutes Use with permission: C.L. Chai-Coetzer, MD chingli.chai@health.sa.gov.au
Restless legs syndrome
International Restless Legs Syndrome Scale42	Evaluate the severity of RLS related symptoms and their impact on sleep quality, daily affairs, and mood	10-item self-rated on Likert scale Scale score range from 0 = no symptoms to 4 = very severe symptoms	Higher total scores indicate worse severity and impact of RLS symptoms Internal consistency: Cronbach α ranges from 0.93 to 0.95	Use with permission: Mapi Research Trust http://www.mapi-trust.org/

Note: OSA, obstructive sleep apnea; RLS, restless legs syndrome