Table 2.
Confusion Matrix of Identifying Subjects with SDB Based on PSG AHI and AHI Estimated from Holter Analysis
| Holter Estimate | Polysomnography Classification |
|||
|---|---|---|---|---|
| N | I | A | Row Total | |
| n | 10 | 1 | 2 | 13 |
| i | 9 | 9 | 2 | 20 |
| a | 8 | 5 | 46 | 59 |
| Column Total | 27 | 15 | 50 | 92 |
A/a: Apnea/ clinically significant SDB (AHI ≥15), N/n: No apnea/ clinically insignificant SDB (AHI <5), I/i: Indeterminate test results (5 ≤ AHI < 15). Each cell indicates the number of subjects who had been classified as N, I or A by polysomnography and as n, i or a by Holter analysis. For example cell (n,A) shows that 2 subjects were classified as having apnea by polysomnography but Holter analysis indicated they do not have apnea. For calculation of (conditional) likelihood ratios, i.e., likelihood ratios conditional on obtaining either a positive or negative result, only the numbers in boldface were considered.