Table 1.

Comparison of clinical data between the two groups

Factors	Delirium group (n = 49)	Non-delirium group (n = 165)	χ2/t	P
Sex			0.103	0.748
Male	28	90
Female	21	75
Age (years)	67.34±8.00	62.29±5.47	5.069	<0.001
BMI (kg/m2)	23.29±4.00	22.96±3.77	0.535	0.594
Course of disease	2.71±0.78	2.73±0.83	0.174	0.862
Comorbid hypertension			1.799	0.180
Yes	10	21
No	39	144
Comorbid diabetes mellitus			4.727	0.030
Yes	20	41
No	29	124
Timing of surgery			0.131	0.718
Selective operation	31	109
Emergency operation	18	56
Preoperative NYHA classification			18.071	<0.001
I-II	15	107
III-V	34	58
History of smoking			2.984	0.084
Yes	18	40
No	31	125
History of alcohol consumption			1.178	0.278
Yes	16	41
No	33	124
Place of incidence			2.522	0.112
Urban areas	24	60
Rural areas	25	105

Notes: BMI: body mass index; NYHA: New York Heart Association.