condition mean min max ZT0-3 8.908470000000001 8.908470000000001 8.908470000000001 ZT4-7 9.884545 9.884545 9.884545 ZT8-11 7.137594999999999 7.137594999999999 7.137594999999999 ZT12-15 7.667909999999999 7.667909999999999 7.667909999999999 ZT16-19 8.89198 8.89198 8.89198 ZT20-23 8.171365 8.171365 8.171365