Table 2

Age- and sex-adjusted mean remote-sensing-derived estimates of concentrations PM_2.5 (2001–2006) for selected behavioural chronic disease risk factors, participants of the 2003 Canadian Community Health Survey, for Canada and Ontario

Characteristic	Canada (n=122 548)			Ontario (n=40 403)
Characteristic	N	Mean μg/m³	95% CI	N	Mean μg/m³	95% CI
Smoking status at interview
Daily	23 032	7.79	7.74 to 7.83	7228	11.02	10.93 to 11.11
Occasional	3560	8.01	7.89 to 8.13	1187	11.32	11.11 to 11.54
Always occasional	2143	8.16	8.01 to 8.32	706	11.53	11.25 to 11.82
Former daily	31 794	7.66	7.61 to 7.70	9913	10.90	10.83 to 10.98
Former occasional	18 484	7.95	7.90 to 8.01	6051	11.39	11.29 to 11.48
Never	43 180	8.21	8.18 to 8.25	15 242	11.69	11.63 to 11.76
Missing	355			76
Ever smoke 100 cigarettes
Yes	62 623	7.75	7.72 to 7.78	19 731	11.00	10.95 to 11.06
No	59 767	8.14	8.11 to 8.17	20 637	11.62	11.56 to 11.67
Missing	158			35
Restrict smoking in home
Yes	73 312	8.03	8.00 to 8.05	26 559	11.44	11.39 to 11.48
No	48 546	7.80	7.76 to 7.83	13 533	11.07	11.01 to 11.13
Missing	690			311
Physical-activity level
Active	32 295	7.81	7.76 to 7.85	10 814	11.06	10.99 to 11.13
Moderate	29 585	7.95	7.90 to 7.99	9892	11.22	11.14 to 11.29
Inactive	57 984	8.02	7.99 to 8.05	18 787	11.53	11.47 to 11.58
Missing	2684			910
Body mass index^*
Underweight	2469	8.59	8.45 to 8.74	820	11.99	11.72 to 12.25
Normal	47 655	8.14	8.11 to 8.18	15 799	11.53	11.47 to 11.59
Overweight	37 243	7.84	7.80 to 7.88	12 330	11.18	11.11 to 11.24
Obese	18 565	7.65	7.60 to 7.71	6031	10.99	10.90 to 11.09
Missing	16 616			5423

↵* Body mass index (BMI) categories were defined as follows: underweight (BMI<18.5), normal (18.5≤BMI<25), overweight (25≤BMI<30) and obese (BMI≥30).
N, number of participants.