Table 5.
Interval‐Level and Patient‐level Sensitivity and Specificity by Fitzpatrick Scale Score
| Fitzpatrick scale score | Unevaluable intervals/total number of intervals (%) | Interval‐level sensitivity (95% CI) | Interval‐level specificity (95% CI) | Patient‐level sensitivity (95% CI) | Patient‐level specificity (95% CI) |
|---|---|---|---|---|---|
| I (10 subjects) | 1696/11 825 (14.3%) | 98.4 (96.8–99.4)† | 98.0 (96.6–99.6) | 100.0 (2.5% ‐ 100.0) | 55.6 (21.2–86.3) |
| II (17 subjects) | 3600/19 175 (18.8%) | 94.2 (87.5–98.3) | 97.5 (95.3–100.0) | 100.0 (29.2–100.0) | 85.7 (57.2–98.2) |
| III (42 subjects) | 8610/42 975 (20.0%) | 97.4 (92.2–99.2) | 99.5 (99.1–99.8) | 87.5 (61.7–98.4) | 61.5 (40.6–79.8) |
| IV (26 subjects) | 6257/27 686 (22.6%) | 95.4 (83.6–97.8) | 95.9 (93.0–99.4) | 87.5 (47.3–99.7) | 50.0 (26.0–74.0) |
| V/VI* (16 subjects) | 6952/17 311 (40.2%) | 92.5 (56.7–99.1) | 99.5 (99.3–99.8) | 100.0 (39.8–100.0) | 50.0 (21.1–78.9) |
*
Only 5 subjects were observed with a Fitzpatrick scale score of VI. Due to the low numbers, subjects with Fitzpatrick scale scores of V and VI were combined into a single group.
†
Low number of subjects in this group precluded the use of cluster bootstrap estimates of CIs for sensitivity. CIs are instead reported above based on exact binomial.
Though the Fitzpatrick Category I subgroup includes 10 total subjects, only a single subject in this subgroup had AF episodes during the study, thus contributing to the wide confidence interval for sensitivity among Fitzpatrick Category I subjects.