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. 2019 Nov 2;9(11):e024393. doi: 10.1136/bmjopen-2018-024393

Table 2.

Prevalence of syphilis seropositivity and active infection among blood donors in different age groups

Age group	No of screened	Syphilis seropositivity				Active infection
Age group	No of screened	No	Prevalence per 100 000 (95% CI)	χ² _trend	P_trend value	No	Prevalence per 100 000 (95% CI)	χ² _trend	P_trend value
Aged <25 years	95 736	158	165.0 (139.3 to 190.8)	311.9	<0.001	113	118.0 (96.3 to 139.8)	72.1	<0.001
Aged 25–34 years	137 447	376	273.6 (245.9 to 301.2)			211	153.5 (132.8 to 174.2)
Aged 35–44 years	102 422	559	545.8 (500.7 to 590.9)			243	237.3 (207.5 to 267.0)
Aged ≥45 years	59 187	368	621.8 (558.4 to 685.1)			166	280.5 (237.9 to 323.1)