Table:
Factor	Category	Number positive	Number tested	Prevalence (%) (95% CI)	OR (95% CI)	P value
Region	Beijing	16	163	9.82 (5.26–14.38)	Reference	0.06
Shangqiu	31	187	16.58 (11.25–21.91)	0.55 (0.29–1.04)
Species	White Java sparrow	37	225	16.44 (11.60–21.28)	Reference	0.03
Gray Java sparrow	10	125	8.00 (3.24–12.76)	2.26 (1.08–4.73)
Sex	Female	26	64	40.63 (28.60–52.66)	Reference	<0.01
Male	21	286	7.34 (2.22–12.46)	8.63 (4.43–16.84)
Age	3~5 months	11	92	11.95 (5.33–18.57)	Reference	0.38
6~8 months	25	153	16.33 (10.47–22.19)	0.70 (0.49–2.82)
>8 months	11	105	10.47 (4.61–16.33)
Total	47	350	13.42 (9.85–16.99)

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| Factor | Category | Number positive | Number tested | Prevalence (%) (95% CI) | OR (95% CI) | P value | 
 | --- | --- | --- | --- | --- | --- | --- | 
 | <ROWSPAN=2> Region | Beijing | 16 | 163 | 9.82 (5.26–14.38) | Reference | <ROWSPAN=2> 0.06 | 
 | Shangqiu | 31 | 187 | 16.58 (11.25–21.91) | 0.55 (0.29–1.04) | 
 | <ROWSPAN=2> Species | White Java sparrow | 37 | 225 | 16.44 (11.60–21.28) | Reference | <ROWSPAN=2> 0.03 | 
 | Gray Java sparrow | 10 | 125 | 8.00 (3.24–12.76) | 2.26 (1.08–4.73) | 
 | <ROWSPAN=2> Sex | Female | 26 | 64 | 40.63 (28.60–52.66) | Reference | <ROWSPAN=2> <0.01 | 
 | Male | 21 | 286 | 7.34 (2.22–12.46) | 8.63 (4.43–16.84) | 
 | <ROWSPAN=3> Age | 3~5 months | 11 | 92 | 11.95 (5.33–18.57) | Reference | <ROWSPAN=3> 0.38 | 
 | 6~8 months | 25 | 153 | 16.33 (10.47–22.19) | 0.70 (0.49–2.82) | 
 | >8 months | 11 | 105 | 10.47 (4.61–16.33) |  | 
 | Total |  | 47 | 350 | 13.42 (9.85–16.99) |  |  |