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Table 1 Demographic variables of participants tested for ZIKV

From: Screening for Zika virus RNA in sera of suspected cases: a retrospective cross-sectional study

Demographics N (%)** RT-qPCR positive (%) RT-qPCR negative (%) OR 95% CI p value
Sex
 Female 2111 (70.3) 268 (12.7) 1843 (87.3) 1.59 (1.22–2.10) 0.0005***
 Male* 887 (29.5) 74 (8.3) 813 (91.6)   
Age group
  < 1–11 m*‡ 99 (3.3) 7 (7.1) 92 (92.9)   0.90
 1–10 y 237 (7.9) 16 (6.8) 221 (93.2)   0.83
 11–20 y 179 (5.9) 14 (7.8) 165 (92.8)   0.07
 21–30 y 536 (17.8) 71 (13.2) 465 (86.8)   0.10
 31–40 y 1007 (33.5) 126 (12.5) 881 (87.5)   0.21
 41–50 y 287 (9.5) 33 (11.5) 254 (88.5)   0.187
  > 50 y 645 (21.5) 74 (11.5) 571 (88.5)   
Brazilian regions
 South* 201 (6.7) 7 (3.4) 194 (96.5)   <  0.0001†
 North 216 (7.2) 35 (16.2) 181 (83.8) 5.35 (2.32–12.36)  
 Southeast 1240 (41.3) 175 (14.1) 1065 (85.8) 4.55 (2.10–9.84)  
 Midwest 577 (19.2) 94 (16.2) 483 (83.7) 5.39 (2.45–11.83)  
 Northeast 767 (25.5) 31 (4.0) 736 (95.9) 1.16 (0.50–2.69)  
  1. *reference categories to which the other categories were compared to. m: months. y: years. **Total may not add up 100% due to missing data. RT-qPCR: reverse transcription followed by real-time polymerase chain reaction. OR: Odds ratio. 95% CI: 95% confidence interval. ***Analysis performed using Fisher’s exact test. Individuals included in this category are those with age ranging from < 1 month to 11 months. †Analysis performed using Chi-square for trend. Brazilian states in each region are as follows: South: Rio Grande do Sul, Paraná, and Santa Catarina; North: Acre, Amapá, Amazonas, Pará, Rondônia, Roraima, and Tocantins; Southeast: Minas Gerais, São Paulo, Rio de Janeiro and Espírito Santo; Midwest: Mato Grosso, Mato Grosso do Sul, Goiás and Distrito Federal; Northeast: Alagoas, Bahia, Ceará, Maranhão, Paraíba, Pernambuco, Piauí, Rio Grande do Norte and Sergipe