Table 1 Estimated annual number of persons with dog bites and incidence, by selected person and household characteristics, ICARIS-2, USA

Characteristic	Samplesize	Reported dog bites			p Value*
Characteristic	Samplesize	Count	Nationalestimate	Rate per 1000population (95% CI)	p Value*
Adults	9672†	157	3 582 600	16.6 (13.4 to 19.9)	–
Sex
Male	4801	84	1 980 100	19.0 (14.0 to 24.0)	0.1736
Female	4871	73	1 602 400	14.4 (10.1 to 18.7)
Age group (years)
18–24	829	25	777 400	30.2 (15.8 to 44.5)	0.0210¶
25–34	1603	30	727 400	18.3 (10.3 to 26.3)
35–44	2105	28	612 700	13.4 (7.5 to 19.4)
⩾45	4974	71	1 388 100	13.8 (9.6 to 17.9)
Household income
<$34 999	3006	46	1 094 300	17.1 (11.0 to 23.2)	0.8736
$35 000–$49 999	1450	21	689 500	20.1 (9.9 to 30.4)§
⩾$50 000	3825	73	1 506 100	17.7 (12.6 to 22.9)
Household education
⩽High school	2606	34	697 400	12.1 (7.2 to 17.1)	0.1213
Some post-high school	1900	35	957 300	22.0 (13.2 to 30.9)
College graduate	5064	88	1 927 900	17.2 (12.6 to 21.9)
Census region
Northeast	2161	35	797 700	19.3 (11.7 to 26.9)	0.4509
Midwest	1649	25	622 600	12.8 (6.9 to 18.7)§
South	4028	65	1 205 500	15.6 (10.4 to 20.9)
West	1834	32	956 700	19.9 (11.8 to 28.0)
No of dogs in household
None	6189	44	941 800	7.2 (4.6 to 9.8)	0.0001¶
One	2252	70	1 569 800	29.7 (20.9 to 38.5)
Two or more	1225	43	1 071 000	34.3 (21.3 to 47.3)
Medically attended	9672	31	644 900	3.0 (1.6 to 4.5)	–
Children (0–14 years)	5638‡	79	789 300	13.1 (9.8 to 16.3)	–
Sex
Boys	2859	43	391 300	12.7 (8.5 to 16.9)	0.8101
Girls	2736	36	397 900	13.5 (8.6 to 18.5)
Age group (years)
0–4	1709	17	169 100	8.7 (3.9 to 13.5)	0.0607
5–9	1825	37	366 000	18.7 (11.9 to 25.5)
10–14	2029	25	254 100	12.2 (7.0 to 17.4)
No of dogs in household
None	3318	29	293 100	8.3 (4.8 to 11.8)	0.0064¶
One	1552	31	275 000	16.1 (9.7 to 22.6)
Two or more	766	19	221 200	26.6 (13.9 to 39.2)§
Medically attended	5638	20	191 100	3.2 (2.0 to 5.2)	–

*Log likelihood χ² test.
†Excludes data from 12 adult respondents (six men, six women) for whom dog bite status was not known. Numbers may not add up to the total because of missing values.
‡Excludes data from five children (two boys, three girls) for whom dog bite status was not known. Numbers may not add up to the total because of missing values.
¶Test for linear trend.
§Potentially unstable (23%<RSE⩽30%).