Table 3.

Male and Female Syphilis Seroprevalence in Different Age Groups at Jinan Blood Center, China, 2007–2021

Variables	Male			Female			χ2	P-value
	Number of Donors	Number of Seropositives	Prevalence%	Number of Donors	Number of Seropositives	Prevalence %
18–24	162,653	281	0.17	99,329	285	0.29	37.284	0.000
25–34	142,941	412	0.29	39,521	227	0.57	72.642	0.000
35–44	123,933	483	0.39	34,740	210	0.60	28.781	0.000
45–60	74,918	282	0.38	22,722	110	0.48	5.057	0.025