Table 3.

Regression analysis results of the effects of comorbidity presence on day of PNX occurrence.

Variable	Group	Beta	SE	t	p
Comorbidity	Yes	[Ref]	-	-	-
	No	4.140	3.358	1.233	0.226
Constant		8.217	2.066	3.978	<0.001
R2 = 0.042
F-statistic = 1.520
p value = 0.226

Beta: coefficient; SE: standard error; R²: coefficient of determination; t: time (day).