condition mean min max ZT0-3 992.4 992.4 992.4 ZT4-7 1682.0 1682.0 1682.0 ZT8-11 1571.45 1571.45 1571.45 ZT12-15 1445.3000000000002 1445.3000000000002 1445.3000000000002 ZT16-19 1206.9 1206.9 1206.9 ZT20-23 776.3 776.3 776.3