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Table 1 Demographic and parasitological characteristics of study participants

From: Increased investment in gametocytes in asymptomatic Plasmodium falciparum infections in the wet season

  Chulaimbo   Homa Bay  
dry
N = 262
wet
N = 419
  dry
N = 854
wet N = 1324  
Demographic data      
 Age group in years N (%) N (%) N (%) N (%)  
  < 5 45 (17.2) 62 (14.8) 158 (18.5) 227 (17.1)  
 5–15 75 (28.6) 173 (41.3) 154 (18.0) 419 (31.6)  
  > 15 142 (54.2) 184 (43.9) 542 (63.5) 678 (51.2)  
 Female (%) 155 (59.2) 234 (55.8) 578 (67.7) 840 (63.4)  
Parasitological data    P value    P value
 Parasite prevalence 71/262 (27.1%) 202/419 (48.2%) < 0.0001* 80/854 (9.4%) 103/1324 (7.8%) 0.1921
 Geometric mean parasite density 7.79 [3.07–19.7] 11.7 [6.80–20.2] 0.8433 6.87 [3.53–13.4] 5.31 [2.88–9.81] 0.9638
 Proportion subpatent infections (< 100 parasites/μL) 48/71 (67.6%) 135/202 (66.8%) 0.9050 63/80 (78.8%) 83/103 (80.6%) 0.7595
 Population gametocyte prevalence 27/262 (10.3%) 50/419 (11.9%) 0.5140 24/854 (2.8%) 18/1324 (1.4%) 0.0162*
 Proportion gametocyte positive infections 27/71 (38.0%) 50/202 (24.8%) 0.0325* 24/80 (30.0%) 18/103 (17.5%) 0.0457*
 Geometric mean pfs25 density 1.37 [0.79–2.36] 4.74 [2.36–9.55] 0.0181* 0.77 [0.54–1.10] 1.42 [0.76–2.65] 0.0638
  1. Numbers in brackets are 95% confidence intervals; asterisk (*) indicate significant at P < 0.05; densities are determined using T-test; and differences in prevalence using the Chi-Square test