condition mean min max ZT0-3 10.3963625 9.786175 11.00655 ZT4-7 7.530595 7.530595 7.530595 ZT8-11 9.37086 9.37086 9.37086 ZT12-15 0 0 0 ZT16-19 8.961359999999999 8.961359999999999 8.961359999999999 ZT20-23 9.49752 9.49752 9.49752