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Table 3 Univariate and multivariate analysis for risk factors of Blastocystis infection.

From: Incidence and risk factors of Blastocystis infection in an orphanage in Bangkok, Thailand

Characteristics No. positive for Blastocystis Person-months of follow up IR (100 person-months) IRR (95% CI)
     Crude p value Adjusted p value
Sex        
   Male 29 1491.1 1.9 1   1  
   Female 17 1128.9 1.5 0.8 (0.4-1.5) 0.408 0.7 (0.3-1.5) 0.366
Age (months) 46 2620.0 1.8 1.04 (1.03-1.05) < 0.001 1.04 (1.03-1.05) < 0.001
Nutritional status        
   Normal nutrition 37 1653.9 2.2 1   1  
   Undernutrition 4 655.8 0.6 0.3 (0.1-0.8) 0.006 0.3 (0.1-0.9) 0.044
   Overnutrition 4 215.9 1.9 0.8 (0.2-2.3) 0.851 0.5 (0.1-2.5) 0.417
HIV infection        
   No 34 2116.9 1.6 1   1  
   Yes 10 444.4 2.3 1.4 (0.6-2.9) 0.352 1.7 (0.6-4.9) 0.313
Infected childcare worker(s) in the room        
   No 16 1613.8 0.9 1   1  
   Yes 24 723.4 3.3 3.3 (1.7-6.7) 0.002 3.1 (1.3-7.6) 0.014
  1. Data were adjusted for sex and HIV infection status. IR = incidence rate; IRR = incidence rate ratio