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Table 1 Toxoplasma gondii seroprevalence a by demographic characteristics for participants ≥6 years old; NHANES 1999–2004, 2009-10 b

From: Drinking water source and human Toxoplasma gondii infection in the United States: a cross-sectional analysis of NHANES data

Variable N Prevalence (%)c 95% CL P
Overall 23030 2642 (11.7) 10.8,12.6  
Continuous NHANES survey year     0.0116
 1999-2000 5089 602 (13.3) 11.6,15.1  
 2001-2002 5751 527 (9.3) 7.1,11.4  
 2003-2004 5120 434 (10.8) 8.6,13.0  
 2009-2010 7070 1079 (13.2) 11.9,14.4  
Age group (years)     <0.0001
 6-12 4274 155 (3.5) 2.5,4.4  
 13-17 4693 279 (4.6) 3.7,5.6  
 18-28 4810 488 (9.2) 7.7,10.7  
 29-43 4799 757 (14.0) 12.4,15.6  
 44-80 4450 963 (17.7) 16.0,19.4  
Gender     0.0133
 Male 11239 1402 (12.6) 11.4,13.8  
 Female 11791 1240 (10.8) 9.8,11.9  
Race/ethnicity     <0.0001
 Non-Hispanic White 8546 854 (9.9) 8.8,11.0  
 Non-Hispanic Black 5535 566 (12.6) 10.7,14.5  
 Mexican American 6441 749 (13.6) 11.7,15.5  
 Other Hispanic 1490 366 (24.8) 19.7,30.0  
 Other, incl multi-racial 1018 107 (12.9) 10.1,15.7  
Poverty indexd,e     <0.0001
 Below 5807 744 (14.3) 12.5,16.1  
 At or above 15454 1621 (10.9) 9.9,11.8  
Country of origind     <0.0001
 United States 18358 1401 (8.9) 7.9,9.9  
 Mexico 2661 614 (24.1) 21.4,26.7  
 Elsewhere 2005 627 (29.2) 25.7,32.7  
  1. aFor Continuous NHANES 1999–2004: IgG ≥10 IU = positive; IgG <10 IU = negative. For Continuous NHANES 2009–2010: IgG ≥33 IU/mL = positive; IgG <33 IU/mL = negative. b T. gondii serology performed only among participants ages 6–49 for 1999–2004 data. cAll prevalence estimates were weighted. dCovariate has some missing data. eFamily income-to-poverty ratio (FIPR) categorized as 0.00–0.99 = below poverty; 1.00 and above = at or above poverty.