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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%