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Table 6 Statistical analysis of metacercariae counts and FZT infection status (not infected, infected) of fish collected in 25 ponds located in two communes, Nhgia Lac and Nhgia Phu, in Nam Dinh province, northern Vietnam during the main FZT transmission season (July-November)

From: The role of rice fields, fish ponds and water canals for transmission of fish-borne zoonotic trematodes in aquaculture ponds in Nam Dinh Province, Vietnam

Factor (No. of sites sampled) No. of fish Intensity of infection Infection status
   Count ratio (uni-variablea) Count ratio (multi-variable) Odds ratio (uni-variablea) Odds ratio (multi-variable)
Time of sampling      
 August (25) 254 1.00   1.00  
 October (22) 221 1.47 1.90* 1.88** 1.98**
 December (21) 213 2.77* 2.98*** 2.84*** 3.22***
Fish species (ponds)      
C. idellus (20) 91 1.00 1.00 1.00 1.00
H. molitrix (21) 192 0.80 0.63
C. mrigala (21) 90 0.07*** 0.14* 0.52
 Other species (19) 119 0.21** 0.26* 0.34***
L. rohita (25) 196 0.04*** 0.04*** 0.20***
Commune      
 Nghia Lac (12) 365 1.00   1.00 1.00
 Nghian Phu (13) 323 1.80   2.41*** 2.29***
Snail density      
August in ponds      
 None (5) 119 1.00 1.00 1.00  
 Low (10) 293 1.29 1.01  
 High (10) 276 2.26 2.62* 1.34  
August in small canals      
 Absent (19) 525 1.00   1.00  
 Present (6) 163 0.61   0.74  
August in rice fields      
 Absent (17) 462 1.00   1.00  
 Present (8) 226 0.65   1.17  
  1. aUnivariable tests are not really uni-variable because time of sampling was included as well; * p < 0.05; ** p < 0.01; *** p < 0.001