Table 2 Adjusted odds ratio (OR) and 95% confidence intervals for the SHS exposure, current smoking, smoking awareness and quitting intention

Male

SF workplace policy

0.44**(0.39–0.48)

0.83**(0.76–0.90)

1.77**(1.57–2.01)

1.04(0.88–1.23)

Education

 Master and above

Ref

Ref

Ref

Ref

 Bachelor degree

1.51**(1.30–1.74)

1.76**(1.54–2.01)

0.89 (0.77–1.03)

0.86 (0.60–1.25)

 High school

2.01**(1.63–2.47)

3.67**(3.13–4.35)

0.52**(0.42–0.65)

0.69 (0.471.03)

 Middle school and lower

1.72**(1.23–2.41)

3.13**(2.46–4.00)

0.34**(0.22–0.53)

0.85 (0.51–1.42)

Chronic disease

 No

Ref

Ref

Ref

Ref

 Yes

1.31**(1.17–1.46)

1.06 (0.98–1.16)

0.96 (0.85–1.07)

1.09 (0.91–1.29)

Year effect

 2018

Ref

Ref

Ref

Ref

 2019

0.93 (0.85–1.03)

0.93 (0.86–1.00)

1.39** (1.26–1.54)

1.19 *(1.01–1.39)

Female

SF workplace policy

0.51**(0.47–0.55)

0.96(0.80–1.16)

1.74**(1.54–1.96)

0.42*(0.19–0.95)

Education

 Master and above

Ref

Ref

Ref

Ref

 Bachelor degree

1.80**(1.60–2.03)

1.36 (0.98–1.85)

1.07 (0.92–1.24)

0.80 (0.18–3.51)

 High school

2.23**(1.88–2.63)

1.84**(1.23–2.76)

0.68**(0.53–0.86)

0.65 (0.13–3.25)

 Middle school and lower

1.51**(1.16–1.95)

1.63 (0.90–2.96)

0.29**(0.17–0.50)

1.75 (0.16–18.70)

Chronic disease

 No

Ref

Ref

Ref

Ref

 Yes

1.35**(1.24–1.47)

1.38**(1.15–1.66)

0.90 (0.80–1.00)

1.09 (0.53–2.26)

Year effect

 2018

Ref

Ref

Ref

Ref

 2019

0.88**(0.82–0.94)

0.80* (0.67–0.96)

1.41** (1.29–1.55)

1.00 (0.52–1.95)

All sample

SF workplace policy

0.48**(0.45–0.51)

0.81**(0.76–0.87)

1.76**(1.61–1.91)

0.99(0.84–1.16)

Education

 Master and above

Ref

Ref

Ref

Ref

 Bachelor degree

1.68**(1.53–1.84)

1.53**(1.36–1.72)

0.98 (0.88–1.08)

0.87 (0.61–1.24)

 High school

2.11**(1.86–2.41)

2.88**(2.50–3.31)

0.60**(0.51–0.70)

0.69 (0.47–1.01)

 Middle school and lower

1.56**(1.28–1.92)

2.55**(2.09–3.11)

0.32**(0.23–0.45)

0.89 (0.54–1.46)

Chronic disease

 No

Ref

Ref

Ref

Ref

 Yes

1.34** (1.25–1.43)

1.19** (1.11–1.28)

0.93 (0.86–1.00)

1.10 (0.93–1.30)

Year effect

 2018

Ref

Ref

Ref

Ref

 2019

0.90**(0.85–0.95)

1.05 (0.98–1.11)

1.40** (1.30–1.50)

1.17* (1.00–1.37)