Variable | High mortality (n = 9) | Low mortality (n = 10) | P valuea | ||||
---|---|---|---|---|---|---|---|
25 pct. | Median | 75 pct. | 25 pct. | Median | 75 pct. | ||
ECM (kg)/year 2008/09 | 8475 | 9516 | 10,207 | 9265 | 10,234 | 10,409 | 0.24 |
Herd sizeb 2006/07 | 153 | 184 | 226 | 129 | 134 | 169 | 0.071 |
Herd sizeb 2008/09 | 154 | 175 | 222 | 141 | 151 | 170 | 0.28 |
% Herd expansionc | − 0.058 | − 0.013 | 0.11 | − 0.040 | 0.074 | 0.10 | 0.80 |