Closed thoracic drainage in elderly patients with chronic obstructive pulmonary disease complicated with spontaneous pneumothorax: A retrospective study

Table 4 Univariate analysis of patients with catheter prolapses, n (%)

Factors	CP group (n = 16)	nCP group (n = 44)	t/χ2	P value
Gender			0.006	0.936
Male	10	27
Female	6	17
Age (year)	68.38 ± 9.493	70.84 ± 6.975	-1.096	0.278
BMI (kg/m2)			1.899	0.618
< 18.5	1	3
18.5-24.9	13	28
25-29.9	2	9
> 30	0	4
Lung recruitment time (d)	2.30 ± 0.81	1.81 ± 0.75	2.226	0.06
Operating time (min)	12.69 ± 1.35	12.27 ± 1.26	1.103	0.274
Catheters survival life (d)	4.97 ± 0.81	4.68 ± 0.60	1.489	0.142
Hospitalization time (d)	6.13 ± 0.72	6.18 ± 0.69	-0.279	0.782
Hospitalization costs (thousand yuan)	47.25 ± 9.60	44.95 ± 9.93	0.799	0.428
Primary nurses working years ≤ 3	10 (62.5)	19 (43.18)	13.137	0a
APACHE-II score ≤ 15	6 (37.5)	11 (25)	9.201	0.02a
Not secured with sutures	11 (68.75)	19 (48.18)	13.611	0a
Not fixed twice	9 (56.25)	18 (40.90)	12.623	0a

^aSignificant difference between groups.

^bContinuous correction.

IPC: Indwelling pleural catheter; CVC: Central venous catheter; APACHE-II: Acute Physiology and Chronic Health Evaluation II.