condition mean min max ZT0-3 517.811634 517.811634 517.811634 ZT4-7 451.188698 451.188698 451.188698 ZT8-11 746.6746674999999 746.6746674999999 746.6746674999999 ZT12-15 753.7263614999999 753.7263614999999 753.7263614999999 ZT16-19 829.60006 829.60006 829.60006 ZT20-23 731.2549819999999 731.2549819999999 731.2549819999999