Table 2.

Demographic characteristics, personal behaviors, medical history, and exposure risk factors for persistence of at least a 1/10 amount of A/H5N1 antibodies at 30 months and 36 months

Characteristics	Total	30 mo			36 mo
	n (%)	n (%)	OR (95% CI)1	p-value	n (%)	OR (95% CI)1	p-value
Demographics
Sex
Male	23 (26.7)	17 (73.9)	0.35 (0.09, 1.40)	0.09	10 (43.5)	0.62 (0.21, 1.78)	0.32
Female	63 (73.3)	56 (88.9)	1.00 (reference)		35 (55.6)	1.00 (reference)
Age (yr)
18–40	39 (45.3)	37 (94.9)	5.65 (1.06, 39.87)	0.02	24 (61.5)	1.98 (0.77, 5.17)	0.12
41–65	47 (54.7)	36 (76.6)	1.00 (reference)		21 (44.7)	1.00 (reference)
Personal behaviors
Alcohol use
Yes	17 (19.8)	14 (82.4)	0.79 (0.17, 4.19)	0.74	10 (58.8)	1.39 (0.42, 4.64)	0.55
No	69 (80.2)	59 (85.5)	1.00 (reference)		35 (50.7)	1.00 (reference)
Smoking
Yes	14 (16.3)	11 (78.6)	0.59 (0.12, 3.22)	0.75	6 (42.9)	0.63 (0.17, 2.29)	0.44
No	72 (83.7)	62 (86.1)	1.00 (reference)		39 (54.2)	1.00 (reference)
Medical history
Having flu-like symptoms in the past 18 mo or between 2 visits
Yes	33 (38.4)	29 (87.9)	1.19 (0.32, 4.59)	0.78	1 (11.1)	0.09 (0.01, 0.81)	0.02
No	53 (61.6)	44 (83.0)	1.00 (reference)		44 (57.1)	1.00 (reference)
Having other diseases in the past 18 mo or between 2 visits
Yes	7 (8.1)	7 (100)	-	0.53	0 (0.0)	-	0.43
No	79 (91.9)	66 (83.5)	-		45 (53.6)	-
Exposure risk factors
Having a poultry farm
Yes	53 (61.6)	44 (83.0)	0.70 (0.16, 2.72)	0.76	30 (56.6)	1.57 (0.60, 4.12)	0.31
No	33 (38.4)	29 (87.9)	1.00 (reference)		15 (45.5)	1.00 (reference)
Coming into direct contact with poultry
Yes	49 (57.0)	41 (83.7)	0.80 (0.20, 3.06)	0.72	28 (57.1)	1.57 (0.61, 4.06)	0.30
No	37 (43.0)	32 (86.5)	1.00 (reference)		17 (45.9)	1.00 (reference)
Directly slaughtering and processing poultry
Yes	5 (5.8)	5 (100)	-	0.33	1 (20.0)	0.21 (0.01, 2.15)	0.30
No	81 (94.2)	68 (84.0)	-		44 (54.3)	1.00 (reference)

OR, odds ratio; CI, confidence interval.

¹Univariate logistic regression models.