Table 3.

Diagnostic accuracy of the overall Berlin Questionnaire score and individual categories, AHI ≥ 15 events/h (n = 269).

	Sensitivity	Specificity	PPV	NPV	Positive Likelihood Ratio	Negative Likelihood Ratio
Overall Berlin Questionnaire index	46.2% [32.2%, 60.5%]	72.4% [65.9%, 78.2%]	28.6% [19.2%, 39.5%]	84.9% [78.9%, 89.7%]	1.67 [1.16, 2.40]	0.74 [0.57, 0.97]
Category 1: snoring	46.2% [32.2%, 60.5%]	71.4% [64.9%, 77.3%]	27.9% [18.8%, 38.6%]	84.7% [78.7%, 89.6%]	1.62 [1.13, 2.32]	0.75 [0.58, 0.98]
Category 2: sleepiness	9.6% [3.2%, 21.0%]	85.7% [80.3%, 90.1%]	13.9% [4.7%, 29.5%]	79.8% [74.1%, 84.8%]	0.67 [0.28, 1.65]	1.05 [0.95, 1.17]
Category 3: BMI or high blood pressure	84.6% [71.9%, 93.1%]	28.1% [22.2%, 34.6%]	22.0% [16.5%, 28.4%]	88.4% [78.4%, 94.9%]	1.18 [1.02, 1.36]	0.55 [0.28, 1.07]

Numbers in brackets reflect 95% confidence intervals for each estimate. Sensitivity indicates percentage of those with the condition who are correctly classified as having the condition. Specificity indicates the percentage of those without the condition who are correctly classified as not having the condition. PPV indicates the percentage of those classified as having the condition who actually have the condition. NPV indicates the percentage of those classified as not having the condition who actually do not have the condition. The positive likelihood ratio indicates the probability of a person who has the disease testing positive divided by the probability of a person who does not have the disease testing positive. The negative likelihood ratio indicates the probability of a person who has the disease testing negative divided by the probability of a person who does not have the disease testing negative. BMI = body mass index, NPV = negative predictive value, PPV = positive predictive value.