Table: Chi-Square and Crude Odds Ratios – Syphilis Outbreak Investigation, Copperbelt Province

Variable	N	Crude OR	95% CI	95% CI	p-value
Sex	174
Male		—	—	—
Female		3.64	1.88, 7.24	1.88, 7.24	<0.001
Age Group	172
25–34 years		—	—	—
<25 years		1.29	0.58, 2.91	0.58, 2.91	0.5
35–44 years		0.33	0.13, 0.80	0.13, 0.80	0.016
45+ years		1.04	0.42, 2.61	0.42, 2.61	>0.9
Department	171
OPD		—	—	—
Antenatal		57.6	11.9, 1,039	11.9, 1,039	<0.001
District	174
Kitwe		—	—	—
Ndola		309,396,334,656	0.00, Inf	0.00, Inf	>0.9
Chingola		0.00			>0.9
Luanshya		309,396,315,516	0.00, Inf	0.00, Inf	>0.9
HIV Status	30
Negative		—	—	—
Positive		1.00	0.00, Inf	0.00, Inf	>0.9
Prior Syphilis Treatment	60
No		—	—	—
Yes		0.00			>0.9
Don't Know		330	41.6, 7,944	41.6, 7,944	<0.001
Previously Tested for Syphilis	73
No		—	—	—
Yes		0.08	0.00, 0.45	0.00, 0.45	0.019
Abbreviations: CI = Confidence Interval, OR = Odds Ratio