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Table 3 Patient-reported outcomes (SF-12, MRC scale, and 6 MWD)

From: Effect of average volume-assured pressure support treatment on health-related quality of life in COPD patients with chronic hypercapnic respiratory failure: a randomized trial

Variables

Patients treated with AVAPS

Control group

Treatment Effect (95% CI)

6 months–baseline

P-Value

Baseline

After 6 month

Baseline

After 6 month

SF-36 Scales #

 Vitality

55.2 ± 16.1

64.3 ± 17.5

56.1 ± 17.3

60.5 ± 16.2

5.4(1.4 to 9.3)

0.001*

 General health

56.3 ± 20.5

61.3 ± 16.7

57.6 ± 19.2

58.4 ± 20.2

8.2(3.2 to 11.7)

0.001*

 Physical functioning

72.4 ± 23.8

77.5 ± 21.5

69.3 ± 24.2

69.6 ± 22.1

5.5(1.1 to 9.8)

0.001*

 Bodily pain

62.3 ± 23.2

65.5 ± 22.4

63.7 ± 23.6

66.7 ± 20.8

3.1 (3.4 to 8.8

0.002*

 Emotional Role Functioning

80.6 ± 22.5

83.5 ± 24.7

79.0 ± 24.8

82.3 ± 20.7

−0.5 (−6.8 to 5.3)

0.321

 Physical Role Functioning

69.3 ± 23.3

73.5 ± 26.6

70.8 ± 23.7

73.2 ± 24.8

3.3(−5 to 6.6)

0.001*

 Social Role Functioning

79.6 ± 23.8

83.6 ± 24.7

80.8 ± 21.9

82.9 ± 25.8

1.6 (−3.8 to 6.4)

0.143

 Mental health

74.4 ± 18.6

75.8 ± 12.8

75.6 ± 15.7

75.4 ± 15.4

1.2 (−1.7 to 6.9)

0.543

 PCSS

45.3 ± 9.6

51.3 ± 8.4

44.1 ± 8.4

44.7 ± 7.2

3.7 (1.2 to 5.8)

0.001*

 MCSS

50.3 ± 10.8

53.5 ± 12.7

49.2 ± 11.8

52.7 ± 11.2

1.1 (−2.7 to 2.9)

0.436

 MRC scale #

4.3 ± 0.5

3.1 ± 0.2

4.1 ± 0.7

4 ± 0.4

0.4(−0.2 to 3)

0.213

 6MWD, m #

178.2 ± 24.3

260.5 ± 32.2

179.3 ± 32.1

255.2 ± 30.2

9.2(−1 to 15)

0.001*

  1. Data presented as mean (standard deviation); #: The SF-12, MRC scores, and 6MWD were skewed distributed; therefore a Mann-Whitney U test was performed to compare the changes within the groups; the delta scores were normally distributed, therefore the changes were compared with a regression analysis. A positive mean difference means a decrease or an increase from baseline to 6 months for the S/T AVAPS compared to S/T BiPAP (control)
  2. Abbreviations: SF-12 Short Form 12 Health Survey Questionnaire CI confidence interval PCSS physical component summary score MCSS mental component summary score, MRC Medical Research Council 6MWD 6-min walking distance