Table 1

The baseline characteristics of the participants who do not smoke and their SHS exposure status at workplace (n=8196)

	Total, n	SHS exposure
		Cigarettes		HTPs
		At least once a week	At least several times a week	At least once a week	At least several times a week
		%	%	%	%
Workplace smoke-free policy
Complete smoking bans	6273	11.9	8.0	6.8	4.5
Partial smoking bans with no longer available smoking spaces	402	23.9	12.4	26.4	15.2
Partial smoking bans with still available smoking spaces	1227	22.7	15.6	15.8	10.0
No smoking bans	294	43.2	34.0	24.2	19.4
Sex
Male	4485	17.9	11.9	12.2	7.9
Female	3711	11.9	8.4	6.8	4.6
Age (years)
15–29	1244	20.6	13.8	14.4	8.1
30–49	3742	16.2	10.9	10.5	7.2
50–64	2317	12.8	8.7	7.9	5.4
65–79	893	10.0	7.2	4.9	3.6
Marital status
Married	4923	13.6	8.9	8.7	5.8
Never married	2617	17.9	12.5	11.5	7.5
Widowed/Divorced	656	16.9	11.9	10.1	7.3
Educational level
High school or below	1806	22.8	17.1	13.3	10.0
College	1826	14.2	9.9	8.8	6.3
University or above	4564	12.6	7.8	8.6	5.1
Equivalent household income
<2.75 million JPY	2119	17.9	13.3	11.3	7.9
2.75–4.5 million JPY	2513	16.0	10.6	10.1	6.7
>4.5 million JPY	2441	12.4	7.1	8.5	4.8
Did not know/Did not want to answer	1123	14.4	11.0	8.5	6.5
Regional infection status of COVID-19
Low	2848	16.5	11.8	10.1	7.1
Middle	2449	15.3	9.9	10.0	6.4
High	2899	13.8	9.2	9.1	5.7
Recognition of the adverse health effects of SHS exposure
No	920	20.7	14.7	16.7	10.8
Neither yes nor no	1560	17.2	11.5	11.9	7.5
Yes	5716	13.8	9.3	8.0	5.4
Self-rated health status
Good	4575	13.9	9.5	8.9	5.7
Normal	2627	16.0	10.7	9.7	6.7
Bad	994	19.1	12.9	13.3	8.9
Employment pattern
Permanent employee	4702	17.1	11.6	11.2	7.5
Company executive	402	18.2	12.7	13.7	8.5
Temporary employee	734	12.0	7.8	7.2	4.4
Part-time employee	1641	12.2	8.3	6.6	4.3
Self-employed	717	11.2	8.0	7.3	5.0
Labour type
Manual labour	2086	20.5	14.4	12.0	7.9
Non-manual labour	6110	13.4	8.9	8.9	5.9

Percentages were calculated for each row.
HTPs, heated tobacco products; JPY, Japanese yen; SHS, secondhand smoke.