Table 3. Polysomnography data and nocturnal oximetry results in cases and controls in the present study.a .
| Polysomnography | Group | p | |
|---|---|---|---|
| Control | cHP | ||
| (n = 80) | (n = 40) | ||
| Sleep efficiency, % | 80.6 [73.4-85.3] | 76.5 [63.8-82.3] | 0.01 |
| Sleep latency, min | 8.2 [3.7-16.4] | 35 [10.3-57.8] | < 0.01 |
| REM sleep latency, min | 89.5 [62.8-140.1] | 101.8 [71-162.8] | 0.39 |
| Stage 1 sleep, % | 11.8 [7.7-20.8] | 9.8 [6.3-14.4] | 0.04 |
| Stage 2 sleep, % | 39.1 [32.8-46.1] | 43.5 [34.8-48.2] | 0.10 |
| Stage 3 sleep, % | 25.4 [19.9-30.7] | 28 [21.1-33.7] | 0.55 |
| REM sleep (%) | 19.5 [14.1-23.4] | 18.7 [13.7-24.7] | 0.90 |
| Arousal index, events/h | 21.9 [15.2-31.0] | 14 [8.3-19.3] | < 0.01 |
| Obstructive apnea, n | 10 [1.0-30.8] | 5.5 [0.3-15.8] | 0.26 |
| Central apnea, n | 1.0 [0.0-3.0] | 0.0 [0.0-1.0] | < 0.01 |
| Mixed apnea, n | 0.0 [0.0-3.0] | 0.0 [0.0-1.0] | 0.01 |
| Hypopnea, n | 61.0 [32.0-108.0] | 34.5 [23.3-67.5] | 0.02 |
| RERA, n | 4.0 [1.0-8.8] | 2.5 [0.0-8.8] | 0.23 |
| Respiratory disturbance index | 16.2 [8.3-33.1] | 9.1 [6.0-6.0] | 0.01 |
| AHI, events/h | 14.0 [7.0-31.6] | 8.2 [4.0-14.9] | < 0.01 |
| Baseline SpO2, % | 94.7 [93.3-94.9] | 93.2 [90.9-94.3] | < 0.01 |
| Mean SpO2, % | 93.9 [92.0-94.9] | 92.0 [90.0-93.6] | <0.01 |
| Minimum SpO2, % | 85.0 [80.0-88.0] | 83 [78.3-87.0] | 0.16 |
| T90 | 1.0 [0.1-5.8] | 4.2 [0.4-32.1] | < 0.01 |
cHP: chronic hypersensitivity pneumonitis; REM: rapid eye movement; RERA: respiratory effort-related arousal; AHI: apnea-hypopnea index; and T90: percentage of total sleep time spent below an SpO2 of 90%. aData are presented as median [IQR].