Table 1

Demographic characteristics and secondhand smoke (SHS) exposure in 3999 male current smokers in the Hong Kong Police

Characteristics	No.	%
Missing data were excluded.
*Excluding self-exposure.
†Excluding self.
‡Cigarette-hours were calculated by multiplying the average number of cigarettes smoked by co-workers per hour to which subjects were exposed in the workplace by 8 hours, which is the notional number of working hours per day.
Age (years)
⩽24	844	21.1
25–29	1059	26.5
30–34	789	19.8
35–39	575	14.4
⩾40	724	18.1
Marital status
Single	1796	45.3
Married	2054	51.8
Other	113	2.9
Educational attainment
Grade 10 or below	809	20.8
Grade 11	2891	74.5
Grades 12–13	139	3.6
Post-secondary	43	1.1
Police rank
Police constable	3248	81.6
Sergeant or senior sergeant	638	16.0
Inspector or above	96	2.4
Type of police
Traffic police	548	13.8
Foot patrol	2767	69.5
Marine police	664	16.7
Worked in self perceived dusty or polluted environment before
No	3417	86.7
Yes	526	13.3
Daily amount of cigarette consumption (cigarettes)
1–10	1058	27.4
11–20	1940	50.2
21–30	331	8.6
>30	538	13.9
Duration of cigarette smoking (years)
<5	681	17.4
5 to <10	1170	29.8
10 to <15	920	23.4
15+	1155	29.4
SHS exposure*
None	482	12.5
At home only	194	5.0
At work only	2047	52.9
At home and at work	1146	29.6
Total number of smokers at home and at work†
0	482	12.6
1	446	11.6
2–3	1291	33.7
4–5	695	18.1
⩾6	921	24.0
Number of co-workers smoking nearby at work†
0	688	17.7
1	475	12.2
2	662	17.0
3	769	19.8
⩾4	1294	33.3
Number of smokers at home†
0	2559	65.3
1	949	24.2
2	268	6.8
3	90	2.3
⩾4	50	1.3
Daily amount of SHS exposure at work, number of cigarette-hours‡
0	688	17.6
⩽4	789	20.2
4–16	767	19.6
>16–48	793	20.3
>48	873	22.3