Risk factors

Intervention (%)

Control (%)

χ²

P

Smoking

Yes

105 (18.26)

199 (25.45)

9.845

0.002

No

470 (81.74)

583 (74.55)

Smoking frequency

Every day

79 (75.24)

176 (88.44)

11.83

0.001

Occasional

26 (24.76)

23 (11.56)

Drinking

Yes

66 (11.48)

124 (15.86)

5.276

0.022

No

509 (88.52)

658 (84.14)

Weekly drinking frequency

More than three times

42 (63.64)

86 (69.36)

4.82

0.028

Less than three times

24 (36.36)

38 (30.61)

Blood lipid

mean + standard deviation, mmol/L

t

P

TC

4.39 ± 0.86

4.61 ± 0.95

1.77

>0.05

TG

1.57 ± 0.86

1.55 ± 0.82

0.20

>0.05

LDL-C

2.96 ± 0.77

3.63 ± 0.99

6.09

<0.05

HDL-C

1.12 ± 0.46

0.67 ± 0.48

7.76

<0.05