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Table 1 Basic descriptive statistics of 46 study herds raising finishing pigs in Finland

From: Herd-level risk factors for chronic pleurisy in finishing pigs: a case-control study

Variable n Mean SD Median Min Max
No. of finishing pigs*
 All herds 46 730 250 5400
 Control herds 25 500 250 1100
 Case herds 21 1200 300 5400
No. of finishing pig compartments 46   1 22
No. of finishing pigs/compartment 46 231.3 100.9
No. of finishing pigs/pen 46 10.6 2.8
Piggery constructed (years ago) 41 14 1 62
Piggery reconstructed (years ago) 13 7 0 27
No. of caretakers (/1000 finishing pigs) 46 2.5 0.3 7.3
  1. Mean and standard deviation are reported for normally distributed variables and median, minimum and maximum values for the others
  2. Variables that have a significant association with the main outcome variable (the herd being a case herd with high pleurisy prevalence in slaughterhouse or control herd with low prevalence of pleurisy) are reported separately for control and case herds
  3. *Variables that have a significant association with the main outcome variable (pleurisy) in univariate logistic regression (p ≤ 0.05)