TABLE 3.
Demographic and polysomnographic data in the worst-performing psychomotor vigilance task (PVT) quartile (Q4) and best-performing quartile (Q1) based on each examined PVT outcome
| RRT 1/ms | Median RT ms | Slowest 10% RT ms | Fastest 10% RT ms | Lapses# | ||||||
| Q1 (>2.9) | Q4 (<2.2) | Q1 (<340.0) | Q4 (>445.0) | Q1 (<544.3) | Q4 (>1081.0) | Q1 (<277.0) | Q4 (>335.8) | Q1 (<5) | Q4 (>36) | |
| Patients (female %) | 154 (21.4) | 202 (58.4) | 189 (22.2) | 184 (59.8) | 186 (26.8) | 186 (50.0) | 192 (27.1) | 186 (59.7) | 189 (25.9) | 180 (56.1) |
| Depression | 21 (13.6) | 46 (22.8) | 25 (13.2) | 41 (22.3) | 26 (14.0) | 40 (21.5) | 33 (17.2) | 38 (20.4) | 26 (13.8) | 43 (23.9) |
| Hypertension | 50 (32.5) | 92 (45.5) | 69 (36.5) | 85 (46.2) | 69 (37.1) | 90 (48.4) | 70 (36.5) | 86 (46.2) | 65 (34.4) | 83 (46.1) |
| Smoker | 26 (16.9) | 36 (17.8) | 33 (17.5) | 34 (18.5) | 27 (14.5) | 36 (19.4) | 33 (17.2) | 31 (16.7) | 31 (16.4) | 34 (18.9) |
| COPD | 12 (7.8) | 25 (12.4) | 14 (7.4) | 22 (11.2) | 12 (6.5) | 24 (12.9) | 17 (8.9) | 18 (9.7) | 14 (7.4) | 23 (12.8) |
| Age years | 52.5 (42.8–63.7) | 58.4 (48.9–68.1) | 54.1 (42.9–65.4) | 58.9 (49.9–69.4) | 52.5 (42.8–63.7) | 58.7 (49.0–69.0) | 52.5 (43.0–64.8) | 58.4 (50.2–68.1) | 51.3 (42.8–62.1) | 58.9 (49.4–68.5) |
| BMI kg·m−2 | 34.3 (30.1–40.4) | 35.0 (30.1–41.9) | 34.0 (30.1–40.4) | 35.0 (30.1–42.0) | 34.9 (30.1–41.8) | 35.0 (29.8–40.7) | 35.4 (30.1–40.5) | 35.4 (30.4–41.6) | 33.9 (29.2–40.4) | 34.9 (30.2–42.1) |
| TST h | 5.0 (4.0–5.9) | 5.0 (4.0–5.9) | 5.0 (4.0–5.9) | 5.0 (4.0–6.0) | 5.1 (4.2–6.0) | 5.0 (3.9–5.9) | 5.1 (4.0–5.9) | 4.9 (4.0–5.8) | 5.2 (4.3–5.9) | 4.9 (3.9–5.9) |
| NREM % | 82.0 (77.5–87.2) | 82.9 (78.3–88.2) | 82.0 (77.6–87.6) | 82.9 (78.3–88.3) | 82.1 (77.4–88.5) | 82.6 (78.0–88.2) | 82.5 (78.4–88.5) | 82.6 (78.3–87.8) | 82.1 (77.7–88.2) | 82.5 (78.1–88.2) |
| REM % | 18.1 (12.8–22.5) | 17.2 (11.8–21.7) | 18.0 (12.4–22.4) | 17.1 (11.7–21.7) | 18.0 (11.5–22.6) | 17.4 (11.8–22.0) | 17.5 (11.6–21.7) | 17.4 (12.2–21.7) | 17.9 (11.8–22.3) | 17.5 (11.8–21.9) |
| AHI events·h−1 | 25.8 (13.0–47.2) | 22.2 (11.5–42.1) | 27.0 (13.5–45.7) | 22.5 (11.8–42.1) | 27.5 (13.0–49.4) | 21 (11.4–42.3) | 24.7 (12.0–43.7) | 22.8 (11.5–42.1) | 27.5 (12.9–48.7) | 22.9 (11.8–46.9) |
| ESS score | 9 (5–13) | 11 (6–16) | 9 (5–13) | 11 (6–16) | 9 (5–13) | 11 (6–17) | 10 (6–14) | 11 (5–16) | 9 (5–12) | 11 (6–17) |
Data are presented as n (% of population) or median (interquartile range). RRT: mean reciprocal reaction time; RT: reaction time; BMI: body mass index; TST: total sleep time; NREM: non-rapid eye movement sleep; REM: rapid eye movement sleep; AHI: apnoea–hypopnoea index; ESS: Epworth Sleepiness Scale. #: reaction times >500 ms.