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Table 3 Quantitative and qualitative detection of quinolone non-susceptible Escherichia coli (QNSE) – Hurdle

From: Occurrence of Escherichia coli non-susceptible to quinolones in faecal samples from fluoroquinolone-treated, contact and control pigs of different ages from 24 Swiss pig farms

  group
Trt Ctat Ctrl
weaners mean 2.1 3.3 1.7
x0 72 72 40
count part (CI 95%) 1.888 (1.877–1.899)* 3.757 (3.754–3.760)* 1.707 (1.689–1.725)*
zero part (CI 95%) 1.522 (1.013–2.033) 1.519 (1.009–2.029) 1.497 (0.991–2.003)
fattening pigs mean 2.8 2.2 1.9
x0 51 66 43
count part (CI 95%) 3.378 (3.373–3.383)* 2.800 (2.791–2.809)* 1.936 (1.922–1.949)*
zero part (CI 95%) 4.3E-04# (8.6E-05-2.2E-03) 1.1E-03# (2.2E-04-5.2E-03) 1.3E+ 04# (3.1E+ 03–5.7E+ 04)
  1. Hurdle models: x0 = number of samples with zero QNSE detected, mean = mean of colony forming units (CFU) per gram (g) faeces, count part, zero part = hurdle models with count and zero part and confidence intervals (CI 95%) in log CFU/g faeces. Trt = treated group (G1 and G3), Ctat = contact group (G2 and G4), Ctrl = control group (G5), * = significant values (not overlapping confidence intervals), # = indicates not convertible hurdle models with large and non-useful standard errors