Fig. 5

The percentage of farms where diarrhoea was described to occur in all, or in most batches, as reported by the surveyed Swedish farms related to herd size. An asterisk (*) indicates that there is a significant difference (p < 0.05) between the age categories when the incidences were compared using chi-square tests. The farms were classified as small if they had fewer than 100 sows or produced less than 5000 fatteners annually (n = fatteners 33, other age categories 24), medium if 100–400 sows or produced 5000–10,000 fatteners annually (n = fatteners 74, other age categories 80) or large if they had more than 400 sows or produced > 10,000 fatteners annually (n = fatteners 12, adults 31, other age categories 28)