. 2020 Jun 29;117(29):17204–17210. doi: 10.1073/pnas.1921186117

Table 1.

Seropositive rate of influenza virus in swine workers (SW) and common household population (CHP)

Strain (genotype)	Univariable analysis					Multivariable regression analysis
	SW (n = 338)		CHP (n = 230)		P value, χ²	aOR (95% CI) SW versus CHP	P value
	No. positive	% positive	No. positive	% positive	P value, χ²	aOR (95% CI) SW versus CHP	P value
SW/HN/08/11 (G1 EA H1N1)	22	6.5	5	2.2	0.017	3.02 (1.11 to 8.19)	0.030
Controls for possible cross-reactivity with pdm/09 H1N1						2.60 (0.93 to 7.23)	0.068
SW/SD/1207/16 (G4 EA H1N1)	35	10.4	10	4.4	0.009	2.60 (1.24 to 5.45)	0.012
Controls for possible cross-reactivity with pdm/09 H1N1						2.25 (1.05 to 4.83)	0.038
A/Michigan/45/2015 (pdm/09 H1N1)	131	38.8	73	31.7	0.087	1.38 (0.96 to 1.99)	0.082

Boldface indicates a statistically significant difference (P < 0.05). Model covariates: gender, age group, and collection year.