Table 1. Demographics and basic characteristics in study population
|
Full
|
2018
|
2019
|
Age
|
|
|
|
16-29
|
12179(41.8)
|
6228(43.9)
|
5951(39.8)
|
30-39
|
12852(44.1)
|
5932(41.8)
|
6920(46.3)
|
40-49
|
3643(12.5)
|
1794(12.6)
|
1849(12.4)
|
50 and above
|
474(1.6)
|
241(1.7)
|
233(1.6)
|
Mean age (SD)
|
31.78±7.112
|
31.60±7.273
|
31.95±6.951
|
Gender
|
|
|
|
Male
|
13622(46.7)
|
6408(45.1)
|
7214(48.2)
|
Female
|
15526(53.3)
|
7787(54.9)
|
7739(51.8)
|
Ethnicity
|
|
|
|
Han
|
27888(95.7)
|
13594(95.8)
|
14294(95.6)
|
Others
|
1260(4.3)
|
601(4.2)
|
659(4.4)
|
Marriage
|
|
|
|
Single
|
11015(37.8)
|
5534(39.0)
|
5481(36.7)
|
Married
|
17448(59.9)
|
8491(59.8)
|
8957(59.9)
|
Divorced or widowed
|
329(1.1)
|
170(1.2)
|
159(1.1)
|
Education attainment
|
|
|
|
Middle school or lower
|
761(2.6)
|
476(3.4)
|
285(1.9)
|
High school
|
3301(11.3)
|
2080(14.7)
|
1221(8.2)
|
College
|
22033(75.6)
|
10374(73.1)
|
11659(78.0)
|
Master and above
|
3053(10.5)
|
1265(8.9)
|
1788(12.0)
|
Smoking
|
|
|
|
Yes
|
5912(20.3)
|
2955(20.8)
|
2957(19.8)
|
No
|
23236(79.7)
|
11240(79.2)
|
11996(80.2)
|
Workplace SF policy
|
|
|
|
Yes
|
21275(73.0)
|
10178(71.7)
|
11097(74.2)
|
No
|
7873(27.0)
|
4017(28.3)
|
3856(25.8)
|
Secondhand smoke exposure
|
|
|
|
Never
|
13858(47.5)
|
6429(45.3)
|
7429(49.7)
|
1 to 3 days
|
8906(30.6)
|
4423(31.2)
|
4483(30.0)
|
4 to 6 days per week
|
1931(6.6)
|
981(6.9)
|
950(6.4)
|
Every day
|
4453(15.3)
|
2362(16.6)
|
2091(14.0)
|
Smoking harm awareness
|
|
|
|
Yes
|
4375(15.0)
|
1779(12.5)
|
2596(17.4)
|
No
|
24772(85.0)
|
12416(87.5)
|
12356(82.6)
|
Job position
|
|
|
|
Not administrative
|
19449(66.7)
|
9458(66.6)
|
9991(66.8)
|
Administrative
|
9699(33.3)
|
4737(33.4)
|
4962(33.2)
|
Table 2. Adjusted odds ratio(OR)for SHS exposure by years
|
Full
|
2018
|
2019
|
Male
|
SF workplace policy
|
0.484**(0.444-0.528)
|
0.510**(0.451-0.576)
|
0.460**(0.406-0.521)
|
Constant
|
1.369
|
3.694**
|
1.293
|
Observation
|
13622
|
6408
|
7214
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
Female
|
SF workplace policy
|
0.517**(0.479-0.559)
|
0.558**(0.503-0.618)
|
0.472**(0.421-0.530)
|
Constant
|
1.307
|
1.063
|
1.076
|
Observation
|
15526
|
7787
|
7739
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
All sample
|
SF workplace policy
|
0.501**(0.473-0.530)
|
0.534**(0.494-0.577)
|
0.466**(0.429-0.506)
|
Constant
|
2.028*
|
2.973**
|
1.712
|
Observation
|
29148
|
14195
|
14953
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
P<0.01** P<0.05*
Model was adjusted for age, education attainment, ethnic, marriage, chronic disease, position and night-shift duty.
Table 3. Adjusted ORs for smoking prevalence by years
|
Full
|
2018
|
2019
|
Male
|
SF workplace policy
|
0.827**(0.763-0.897)
|
0.824**(0.737-0.922)
|
0.829**(0.737-0.933)
|
Constant
|
0.150**
|
1.370
|
0.140**
|
Observation
|
13622
|
6408
|
7214
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
Female
|
SF workplace policy
|
0.964(0.799-1.164)
|
0.908(0.718-1.148)
|
1.08(0.785-1.485)
|
Constant
|
0.737
|
0.076*
|
1.866
|
Observation
|
15526
|
7787
|
7739
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
All sample
|
SF workplace policy
|
0.813**(0.761-0.869)
|
0.808**(0.739-0.883)
|
0.819**(0.741-0.904)
|
Constant
|
0.494
|
1.012
|
0.466
|
Observation
|
29148
|
14195
|
14953
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
P<0.01** P<0.05*
Model was adjusted for age, education attainment, ethnic, marriage, chronic disease, position and night-shift duty.
Table 4. Adjusted ORs for smoking harm awareness by years
|
Full
|
2018
|
2019
|
Male
|
SF workplace policy
|
1.773**(1.568-2.005)
|
1.558**(1.303-1.863)
|
1.971**(1.663-2.337)
|
Constant
|
0.043**
|
0.065**
|
0.040**
|
Observation
|
13622
|
6408
|
7214
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
Female
|
SF workplace policy
|
1.736**(1.541-1.955)
|
1.607**(1.359-1.900)
|
1.891**(1.596-2.240)
|
Constant
|
0.029**
|
0.035**
|
0.028**
|
Observation
|
15526
|
7787
|
7739
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
All sample
|
SF workplace policy
|
1.756**(1.612-1.913)
|
1.594**(1.411-1.801)
|
1.929**(1.711-2.175)
|
Constant
|
0.035**
|
0.046**
|
0.035**
|
Observation
|
29148
|
14195
|
14953
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
P<0.01** P<0.05*
Model was adjusted for age, education attainment, ethnic, marriage, chronic disease, position and night-shift duty.
Table 5. Adjusted ORs for quitting intention by years
|
Full
|
2018
|
2019
|
Male
|
SF workplace policy
|
1.036(0.878-1.224)
|
0.942(0.752-1.179)
|
1.170(0.91-1.504)
|
Constant
|
2.985**
|
2.339**
|
5.019**
|
Observation
|
5276
|
2593
|
2683
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
Female
|
SF workplace policy
|
0.440*(0.195-0.994)
|
0.435(0.157-1.204)
|
0.415(0.085-2.023)
|
Constant
|
14.823**
|
16.011**
|
9.089*
|
Observation
|
636
|
362
|
274
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
All sample
|
SF workplace policy
|
0.984(0.837-1.158)
|
0.894(0.719-1.111)
|
1.119(0.875-1.432)
|
Constant
|
3.285**
|
2.733**
|
5.312**
|
Observation
|
5912
|
2955
|
2957
|
All controls
|
Yes
|
Yes
|
Yes
|
Year FE
|
Yes
|
—
|
—
|
P<0.01** P<0.05*
Model was adjusted for age, education attainment, ethnic, marriage, chronic disease, position and night-shift duty.