Table 2. Polysomnographic characteristics of the study population.
| TBE Cases n = 22 | Controls n = 20 | |
|---|---|---|
| Total sleep time, min | 385.3 (82.9) | 387.9 (49.7) |
| Sleep latency, min | 16.4 (3.7–28.8) | 11.3 (6.3–17.1) |
| REM latency, min | 87.4 (51.1) | 90.7 (38.1) |
| WASO, min | 60.0 (40.6–95.6) | 59.5 (31.7–93.6) |
| Sleep efficiency, % | 83.6 (73.0–89.8) | 85.0 (79.4–91.1) |
| Stage N1, min | 38.3 (22.0–81.6) | 46.5(34.4–70.1) |
| Stage N1% of TST | 10.3 (6.6–20.0) | 12.8 (8.3–19.9) |
| Stage N2, min | 203.5 (44.6) | 204.4 (45.2) |
| Stage N2% of TST | 53.7 (10.7) | 52.6 (8.5) |
| Stage N3, min | 57.5 (37.4) | 62.7 (43.9) |
| Stage N3% of TST | 14.3 (9.1) | 16.2 (11.0) |
| Stage REM, min | 75.6 (33.8) | 67.1 (20.3) |
| Stage REM % of TST | 19.0 (6.3) | 17.3 (5.1) |
| Total Arousals | 125.0 (64.0–192.5) | 119.5 (76.0–179.5) |
| Arousal Index, events/h | 18.4 (8.2–35.8) | 18.7 (11.0–31.7) |
| Supine time, min | 152.1 (96.7) | 150.2 (102.6) |
| Supine time % of TST | 39.5 (24.7) | 38.2 (26.6) |
| AHI, events/h | 13.2 (5.5–38.0) | 12.9 (6.7–29.3) |
| Supine AHI, events/h | 21.4 (5.4–66.3) | 17.3 (2.8–46.8) |
| Non-supine AHI, events/h | 6.0 (2.0–17.1) | 4.4 (1.1–18.5) |
| Rem-AHI, events/h | 17.1 (7.1–47.6) | 17.4 (7.5–38.8) |
| Non-REM-AHI, events/h | 10.3 (4.7–32.7) | 11.0 (3.6–28.1) |
| ODI, events/h | 10.5 (3.1–20.7) | 6.5 (3.1–12.7) |
| Mean SpO2% | 93.8 (92.7–94.7) | 94.4 (93.2–94.8) |
| Time spent <90% SpO2%* | 1.4 (0.1–8.6) | 0.2 (0.0–0.6) |
| Min SpO2%* | 85.0 (81.0–88.5) | 89.0 (86.0–90.0) |
Definition of the abbreviations: AHI = Apnea Hypopnea Index; ODI = Oxygen Desaturation Index; REM = Rapid Eye Movement; SpO2 = Oxyhemoglobin saturation; TBE = Tick-Borne Encephalitis; WASO = Wake After Sleep Onset.
Continuous data are presented as mean and standard deviation, or median with 25th and 75th percentiles (metric variables).
*p<0.05