Table 1.

Baseline data of patients

Characteristic	Observation group, n = 151	Control group, n = 678	χ 2 / t-value	P-value
Age, yr	50.29 ± 10.07	48.57 ± 10.02	0.516	0.609
Gender
Male	72	310	0.191	0.662
Female	79	368
BMI	20.76 ± 4.51	20.03 ± 4.27	1.701	0.248
Complications
Hypertensive disease	20	68	1.346	0.246
Diabetes mellitus	31	119	0.739	0.390
Hyperlipidemia	16	60	0.452	0.501

BMI: Body mass index.