condition mean min max ZT0-3 89.25 89.25 89.25 ZT4-7 211.2 211.2 211.2 ZT8-11 139.8 139.8 139.8 ZT12-15 84.19999999999999 84.19999999999999 84.19999999999999 ZT16-19 158.60000000000002 158.60000000000002 158.60000000000002 ZT20-23 168.7 168.7 168.7