Table 2.

Can f 1 levels¹ by household dog ownership², WHEALS cohort, Detroit, MI

	N	n (%) non-detectable	Chi-square p-value	Homes with Detectable Can f 1 only
				N	Can f 1 Geometric mean (95% CI)	p-value
Any dog in home			<0.001			<0.0013
Yes	254	22 (8.7%)		232	1.24 (0.91, 1.71)
No	738	362 (49.1%)		376	0.055 (0.048, 0.063)
Outdoor only dog homes4			0.33			0.0043
Yes	30	12 (40.0%)		18	0.13 (0.07, 0.23)
No dog	738	362 (49.1%)		376	0.055 (0.048, 0.063)
Dog homes4			<0.001			<0.0013
Outdoors only	30	12 (40.0%)		18	0.13 (0.07, 0.23)
Indoors any hours	219	10 (4.6%)		209	1.59 (1.14, 2.21)
Number of dogs			0.91			0.825
1	191	16 (8.4%)		175	1.21 (0.85, 1.74)
2	50	5 (10.0%)		45	1.23 (0.56, 2.69)
3	13	1 (7.7%)		12	1.86 (0.35, 9.99)
In one dog homes where dog allowed indoors
Hours dog indoors			0.99			0.203
≤12 hours	31	2 (6.4%)		29	0.82 (0.32, 2.07)
>12 hours	142	8 (5.6%)		134	1.60 (1.06, 2.42)
Allowed run of house			0.18			0.0033
Yes	120	5 (4.2%)		115	2.02 (1.33, 3.07)
No	53	5 (9.4%)		48	0.61 (0.29, 1.29)
Allowed on furniture			0.21			0.083
Yes	70	2 (2.9%)		68	2.11 (1.20, 3.72)
No	103	8 (7.8%)		95	1.07 (0.65, 1.76)
Allowed in mom’s bedroom			0.74			0.0013
Yes	102	5 (4.9%)		97	2.36 (1.46, 3.79)
No	71	5 (7.0%)		66	0.68 (0.38, 1.20)
Allowed on mom’s bed			0.06			0.0333
Yes	48	0 (0.0%)		48	2.66 (1.36, 5.22)
No	125	10 (8.0%)		115	1.09 (0.70, 1.71)
Allowed in baby’s bedroom			0.95			0.0013
Yes	88	5 (5.7%)		83	2.56 (1.50, 4.37)
No	85	5 (5.9%)		80	0.77 (0.47, 1.27)
Allowed on baby’s bed			0.99			0.743
Yes	6	0 (0.0%)		6	1.94 (0.13, 29.4)
No	167	10 (6.0%)		157	1.41 (0.96, 2.06)

¹All Can f 1 units are in mcg/g

²Mother reported

³Wilcoxon rank sum test

⁴5 homes were excluded because they had both inside and outside dogs

⁵Jonckheere-Terpstra test for trend