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Table 2 Demographic characteristics, history of disease and seropositivity of the study population

From: Genetic polymorphisms associated with anti-malarial antibody levels in a low and unstable malaria transmission area in southern Sri Lanka

Total (1,011) Number (%)
Males 514 (50.8)
Females 497 (49.2)
Age distribution  
14 – 29 380 (37.6)
30 – 44 307 (30.4)
45 – 59 234 (23.1)
60 – 74 71 (7.0)
>75 19 (1.9)
Ethnicity  
Sinhala 1,004 (99.3)
Tamil 7 (0.7)
Moor 0 (0.0)
History of malaria within past 10 years  
Yes 186 (18.4)
No 532 (52.6)
Cannot remember 293 (29.0)
History of malaria within past five years  
Yes 0 (0.0)
No 1,011 (100.0)
Cannot remember 0 (0.0)
Bed net use in 1992/94  
No 111 (10.9)
Yes 896 (88.6)
Cannot remember 4 (0.3)
Bed net use last night  
No 40 (4.0)
Yes 968 (95.7)
No response 3 (0.3)
Seropositivity (sero-prevalence)  
Pf_AMA1 866 (85.66)
Pf_MSP1 845 (83.58)
Pf_MSP2 856 (84.67)
Pf_NANP 919 (90.90)
Total IgE 848 (83.88)
Pv_AMA1 1,007 (99.60)
Pv_MSP1 981 (97.03)