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Table 3 Association of the sustained pattern with clinical data

From: Characteristics of the nocturnal desaturation waveform pattern of SpO2 in COPD patients: an observational study

  Desaturation with sustained pattern
N = 20
Desaturation without sustained pattern
N = 108
P value
Male/female 17/3 99/9 0.399
Age, years 71.5 [65.8–76] 71 [68–75] 0.870
BMI 23.4 [21.4–26.2] 22.6 [20.4–24.3] 0.288
Daytime SpO2, % 96 [95–97] 97 [96–98] 0.016*
Smoking history, pack-years 60 [50–81.5] 50 [40–75] 0.114
%FVC, % 96.4 [87.5–110.9] 89.7 [77.4–98.1] 0.031*
%FEV1, % 68.8 [16.3–79.7] 62.1 [50.3–76.5] 0.441
FEV1/FVC, % 58.2 [45.2–66.2] 60.6 [50.5–66.1] 0.419
PM-AHI 8.4 [4.3–18.2] 19.2 [12.1–28.7] 0.003*
CT90, % 16.4 [1.9–37.1] 2.1 [0.35–6.3] 0.002*
Lowest SpO2, % 85 [80–87.5] 84 [78–87] 0.935
ODI 7.8 [4.6–11.9] 4.4 [2.4–8.6] 0.046*
Hypoxic burden, (%min)/h 46.8 [26.3–91.9] 5.9 [2.4–17.1]  < 0.0001*
  1. Desaturation with the sustained pattern consists of S, S + P, S + I and S + P + I. Desaturation without the sustained pattern consists of I, P and P + I. S: Sustained, P: Periodic, I: Intermittent
  2. PM-AHI, CT90%, Lowest SpO2, ODI and Hypoxic burden were obtained from a pulse oximeter performed during night
  3. The data are presented as median [interquartile range]. *P < 0.05
  4. BMI body mass index, FVC forced vital capacity, FEV1 forced expiratory volume in 1 s, PM-AHI apnoea-hypopnea index from portable monitor, CT90 cumulative percentage time at SpO2 below 90%