Table 2: Multinomial logistic regression models exploring the significant predominant risk age group for Giardia duodenalis infection at IDBG, Kolkata (November 2007–July 2012).

Age in yearsGiardia duodenalis B OR (95% CI)P value

≤5 years 
(n = 960)
1440.561.74 (1.29–2.35)<0.001*
>5–10 years 
(n = 126)
351.333.79 (2.40–6.00)<0.001*
>10–20 years 
(n = 375)
600.631.88 (1.30–2.71)0.001*
>20–30 
(n = 551)
640.261.29 (0.91–1.85)0.150
>30–40 
(n = 416)
37−0.040.96 (0.64–1.46)0.863
>40 years 
(n = 794)
73Reference category

n = sample number.
*Statistically significant.