Table 2. Seroprevalence to T. pallidum and to HIV in the overall study sample and in each indigenous community.

Total				Community A		Community B		Community C
		n/N (%)	OR (95% CI)	n/N (%)	OR (95% CI)	n/N (%)	OR (95% CI)	n/N (%)	OR (95% CI)
Treponema pallidum infection
Total		48/551 (8.71)	-	25/297 (8.42)	-	16/176 (9.09)	-	7/78 (8.97)	-
Sex
	Male	22/253 (8.69)	Ref	10/136 (7.35)	Ref	8/80 (10.00)	Ref	4/37 (10.81)	Ref
	Women	26/298 (8.72)	1.00 (0.55-1.81)	15/161 (9.31)	1.29 (0.56-2.98)	8/96 (8.33)	0.81 (0.29-2.28)	3/41 (7.31)	0.65 (0.13-3.12)
Age group
	11 - 19 years	23/238 (9.66)	Ref	12/139 (8.63)	Ref	7/69 (10.14)	Ref	4/30 (13.33)	Ref
	20 - 39 years	22/247 (8.90)	0.91 (0.49–1.68)	11/139 (7.91)	0.90 (0.39-2.13)	9/77 (11.69)	1.17 (0.41-3.33)	2/31 (6.45)	0.44 (0.07-2.65)
	≥ 40 years	3/66 (4.54)	0.44 (0.12–1.53)	2/19 (10.52)	1.25 (0.25-6.04)	0/30 (0.00)	NA	1/17 (5.88)	0.40 (0.04-3.93)
Range of titers
	1:2 – 1:8	3/48 (6.25)	-	2/25 (8.00)	-	1/16 (6.25)	-	0/7 (12.50)	-
	1:16 – 1:32	32/48 (66.66)	-	11/25 (44.00)	-	14/16 (87.50)	-	7/7 (8.75)	-
	1:64 – 1:128	13/48 (27.08)	-	12/25 (48.00)	-	1/16 (6.25)	-	0/7 (0.00)	-
HIV infection
Total		4/551 (0.72)		2/297 (0.67)		2/176 (1.13)		0/78 (0.00)
Sex
	Male	1/253 (0.39)	Ref	0/136 (0.00)	Ref	1/80 (1.25)	Ref	0/37 (0.00)	Ref
	Women	3/298 (1.00)	2.56 (0.26-24.8)	2/161 (1.24)	NA	1/96 (1.09)	0.83 (0.05-13.5)	0/41 (0.00)	NA
Age group
	11 - 19 years	0/238 (0.00)	NA	0/139 (0.00)	NA	0/69 (0.00)	NA	0/30 (0.00)	NA
	20 - 39 years	3/247 (1.21)	0.79 (0.08-7.81)	1/139 (0.71)	0.13 (0.01-2.17)	2/77 (2.59)	NA	0/31 (0.00)	NA
	≥ 40 years	1/66 (1.51)	Ref	1/19 (5.26)	Ref	0/30 (0.00)	Ref	0/17 (0.00)	Ref

n: number of events; N: sample size; NA: not available; Ref: reference; OR: odds ratio; 95% CI: confidence interval