Table 2. Age group of exposure to first pet dog by diagnostic group.

	Diagnostic Group	Schizophrenia	Bipolar Disorder	Control
		N = 396	N = 381	N = 594
Age of First Pet Dog
Present at Birth	Number	32	71	100
	%	8.08	18.64	16.84
After Birth through Age 3	Number	17	34	46
	%	4.29	8.92	7.74
Age 4–5	Number	48	50	63
	%	12.12	13.12	10.61
Age 6–8	Number	69	54	83
	%	17.42	14.17	13.97
Age 9–12	Number	54	39	77
	%	13.64	10.24	12.96
Any Before age 13	Number	220	248	369
	%	55.55	65.09	62.12
None before Age 13	Number	176	133	225
	%	44.44	34.91	37.88