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Table 2 Preoperative nocturnal breathing characteristics of examined patients

From: Sleep-disordered breathing is a risk factor for delirium after cardiac surgery: a prospective cohort study

  All patients (n = 92) No postoperative delirium (n = 48) Postoperative delirium (n = 44) P
AHI; median (IQR [range]) 18.3 (8.7-32.8 [2-65]) 13.2 (7.1-22.4 [2-51]) 27.7 (14.0-39.7 [2-65]) 0.001
AHI, n (%):     <0.01
<5 9 (9.8) 6 (12.5) 3 (6.8)  
≥5 83 (90.2) 42 (87.5) 41 (93.2)  
≥15 54 (58.7) 21 (43.8) 33 (75)  
≥30 29 (31.5) 8 (16.7) 21 (47.7)  
Mean oxygen saturation; mean ± SD 92.3 ± 1.8 92.5 ± 1.9 92.1 ± 1.6 0.36
Mean oxygen desaturation; mean ± SD 91.7 ± 1.9 92.2 ± 1.8 91.0 ± 1.8 <0.01
Mean minimal oxygen saturation; mean ± SD 77.9 ± 6.3 79.1 ± 5.9 76.3 ± 6.6 0.07
Measured time (in%) spent with an oxygen saturation <90%; mean ± SD 5.8 ± 11.8 4.1 ± 11.7 7.8 ± 11.8 0.17
  1. (Mean oxygen saturation describes the overall mean oxygen saturation during the night. Mean oxygen desaturation is defined as the mean decrease in oxygen saturation during apnea/hypopnea. Mean minimal oxygen saturation describes the mean values of the lowest oxygen saturation measured during the recording time. IQR, interquartile range, data in cells mean ± SD, standard deviation). AHI, apnea-hypopnea index.