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Table 4 Association of the periodic pattern with clinical data

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

  Desaturation with periodic pattern
N = 104
Desaturation without periodic pattern
N = 24
P value
Male/female 95/9 21/3 0.696
Age, years 72 [68–75.8] 68.5 [64.3–75] 0.111
BMI 23.0 [20.7–25.2] 21.5 [20.3–23.6] 0.113
Daytime SpO2, % 97 [96–98] 98 [97–98] 0.003*
Smoking history, pack-years 50.5 [40–79.1] 50 [33.8–70] 0.716
%FVC, % 89.4 [76.45–97.4] 98.1 [87.2–107.6] 0.008*
%FEV1, % 59.8 [50–66.1] 73.9 [59.9–81.3] 0.039*
FEV1/FVC, % 58.2 [45.2–66.2] 61.7 [52.3–66.1] 0.500
PM-AHI 18.4 [10.5–29.0] 16.3 [10.4–22.6] 0.468
CT90, % 6.1 [2.8–14.8] 7.6 [2.8–11.5] 0.738
Lowest SpO2, % 83 [79–86] 88 [85.5–90]  < 0.0001*
ODI 7.5 [4.4–11.8] 2.0 [1.4–3.2]  < 0.0001*
Hypoxic burden, (%min)/h 16.8 [6.5–37.2] 1.6 [0.90–3.0]  < 0.0001*
  1. Desaturation with the periodic pattern consists of P, P + I, S + P and S + P + I. Desaturation without the periodic pattern consists of I, S and S + 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%