Effects of high-flow nasal cannula in patients with persistent hypercapnia after an acute COPD exacerbation: a prospective pilot study

Table 4 Score test for trend of odds between Groups A and B according to ranges of pH values

pH ranges	Group B	Group A	Odds	[95% Conf. Interval]
7.35–7.37	3	7	0.42857	0.11083 -1.65733
7.38–7.39	1	5	0.20000	0.02337 - 1.71188
7.40–7.41	4	6	0.66667	0.18813 - 2.36242
7.42–7.43	6	3	2.00000	0.50020 -7.99688
7.44–7.45	4	1	4.00000	0.44708 -35.78757
≥7.46	7	2	3.50000	0.72709 -16.84797

Score test for trend of odds: p = 0.0038
Patients were divided into two groups: those for whom a reduction of PaCO2 from baseline to 48 h occurred (Group A) and those for whom PaCO2 either increased or changed “minimally” (− 2%) (Group B). This table shows the Score test for trend of odds between the two groups according to ranges of pH values

ISSN: 1471-2466