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Table 2 Association of the intermittent pattern with clinical data

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

  Desaturation with intermittent pattern
N = 108
Desaturation without intermittent pattern
N = 20
P value
Male/female 98/10 18/2 1.00
Age, years 71 [68–75] 71.5 [67.3–75.8] 0.888
BMI 22.6 [20.3–24.6] 22.8 [21.2–24.3] 0.825
Daytime SpO2, % 97 [96–98] 97 [96–97.8] 0.528
Smoking history, pack-years 50 [40–80] 60 [45.5–67.5] 0.737
%FVC, % 90.1 [78.0–99.2] 91.4 [76.6–102.7] 0.646
%FEV1, % 63.1 [50.6–76.6] 58.2 [46.0–79] 0.871
FEV1/FVC, % 60.2 [50–66] 60.3 [51.7–67.0] 0.970
PM-AHI 19.5 [13.1–41.9] 5.7 [3.5–9.3]  < 0.0001*
CT90, % 2.9 [0.72–13.2] 0.445 [0.025–6.7] 0.024*
Lowest SpO2, % 83.5 [77.3–87] 88 [86–90.5]  < 0.0001*
ODI 7.4 [4.0–11.8] 2.0 [1.3–3.3]  < 0.0001*
Hypoxic burden, (%min)/h 13.3 [4.3–33.5] 2.2 [0.92–8.6]  < 0.0001*
  1. Desaturation with the intermittent pattern consists of I, P + I, S + I and S + P + I. Desaturation without the intermittent pattern consists of S, P and S + P. 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%