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Table 5 Mean coughing index (CI) of virus-positive and -negative animals

From: Longitudinal field studies reveal early infection and persistence of influenza A virus in piglets despite the presence of maternally derived antibodies

Mean CI Week 1 Week 3 Week 5 Total
Herd 1
 Virus positive 0.209 0.381 0.032 0.263
 SD 0.21 0.28 0.04 0.26
 Virus negative 0.026 0.223 0.05 0.089
 SD 0.03 0.19 0.03 0.13
 P-value 0.007 0.21 0.44 0.006
Herd 2
 Virus positive 0.042 0.348 0.109 0.168
 SD 0.05 0.16 0.08 0.16
 Virus negative 0.109 0.56 0.088 0.234
 SD 0.12 0.53 0.05 0.36
 P-value 0.40 0.41 0.48 0.48
Herd 3
 Virus positive 0.065 0.186 0.083 0.108
 SD 0.04 0.09 0.03 0.08
 Virus negative 0.090 0.239 0.106 0.166
 SD 0.07 0.26 0.05 0.2
 P-value 0.40 0.64 0.45 0.26
  1. The results were considered significant at P < 0.05. “SD” is the standard deviation.