Table 5 Mean prevalence [%] at the pen level of on-farm indicators and p-value of the t-test for age group 1 (n = 669 pens) and age group 2 (n = 532 pens)
Indicator | age group 1 | age group 2 | p-value | correction factor | ||
|---|---|---|---|---|---|---|
mean | SD | Mean | SD | |||
bursa auxiliaris | 63.0 | 23.4 | 76.4 | 17.8 | < 0.0001 | 1.21 |
bursitis | 1.7 | 3.7 | 2.4 | 4.4 | 0.0012 | 1.41 |
faecal skin dirtying | 9.0 | 16.6 | 12.2 | 18.6 | 0.0020 | 1.36 |
skin lesions | 5.5 | 9.9 | 3.0 | 6.6 | < 0.0001 | 0.54 |
purulent nasal discharge | 2.2 | 4.8 | 1.3 | 3.3 | 0.0002 | 0.59 |
ophthalmic discharge | 4.8 | 7.7 | 8.9 | 12.7 | < 0.0001 | 1.85 |
conjunctivitis | 2.9 | 7.4 | 5.0 | 10.3 | < 0.0001 | 1.72 |
flank biting lesions | 2.2 | 5.9 | 0.7 | 2.9 | < 0.0001 | 0.32 |
tail biting lesions | 2.7 | 8.2 | 3.2 | 8.6 | 0.2694 | -* |
ear haematoma | 1.3 | 3.5 | 1.6 | 3.3 | 0.1415 | -* |
ear biting lesions | 3.1 | 7.5 | 0.9 | 4.9 | < 0.0001 | 0.29 |
lameness | 1.7 | 3.7 | 2.3 | 4.6 | 0.0091 | 1.35 |
coughing index | 1.3 | 0.1 | 1.6 | 0.1 | 0.0843 | -* |