condition mean min max ZT0-3 9.832605000000001 9.832605000000001 9.832605000000001 ZT4-7 7.782805 7.782805 7.782805 ZT8-11 7.75648 7.75648 7.75648 ZT12-15 8.274115 8.274115 8.274115 ZT16-19 12.155000000000001 12.155000000000001 12.155000000000001 ZT20-23 9.337769999999999 9.337769999999999 9.337769999999999