Table 2. Characteristics of the analytical participants for secondhand smoke at the workplace/school (n = 1,003).

	Total	Second hand smoke at workplace/school
		None		Once a week or less		Several times a week		Almost everyday		Missing		P-valuea
	n	n	%	n	%	n	%	n	%	n	%
Age, years
20–39	300	150	50.0	41	13.7	39	13.0	62	20.7	8	2.7	<0.001
40–59	488	267	54.7	57	11.7	53	10.9	72	14.8	39	8.0
≥60	215	103	47.9	25	11.6	23	10.7	18	8.4	46	21.4
Sex
Men	486	213	43.8	64	13.2	63	13.0	94	19.3	52	10.7	<0.001
Women	517	307	59.4	59	11.4	52	10.1	58	11.2	41	7.9
Education, years
≤9	80	20	25.0	9	11.3	10	12.5	16	20.0	25	31.3	<0.001
10–12	445	211	47.4	50	11.2	60	13.5	75	16.9	49	11.0
≥13	476	289	60.7	64	13.4	45	9.5	61	12.8	17	3.6
Missing	2	0	0.0	0	0.0	0	0.0	0	0.0	2	100.0
Income
Low	392	182	46.4	44	11.2	47	12.0	67	17.1	52	13.3	<0.001
Middle	317	171	53.9	42	13.2	33	10.4	51	16.1	20	6.3
High	241	146	60.6	32	13.3	26	10.8	26	10.8	11	4.6
Missing	53	21	39.6	5	9.4	9	17.0	8	15.1	10	18.9
Smoking
Former smoker	342	159	46.5	50	14.6	37	10.8	60	17.5	36	10.5	<0.001
Never smoker	661	361	54.6	73	11.0	78	11.8	92	13.9	57	8.6
Total	1,003	520	51.8	123	12.3	115	11.5	152	15.2	93	9.3
	mean (SD)	mean (SD)		mean (SD)		mean (SD)		mean (SD)		mean (SD)		P-valueb
Number of people in householdc	3.4 (1.2)	3.4 (1.2)		3.3 (1.1)		3.2 (1.3)		3.6 (1.2)		3.4 (1.2)		0.175
Knowledge of the adverse health effects of tobaccod	7.4 (3.3)	7.4 (3.4)		7.3 (3.0)		7.6 (3.3)		7.2 (3.4)		7.5 (3.7)		0.908

SD, standard deviation.

^aP-value from chi-squared test.

^bP-values from analyses of variance.

^cMissing information (n = 114) were excluded.

^dMissing information (n = 2) were excluded.