condition mean min max ZT0-3 52.84111111 52.84111111 52.84111111 ZT4-7 40.839999999999996 40.839999999999996 40.839999999999996 ZT8-11 58.63111111333333 58.63111111333333 58.63111111333333 ZT12-15 70.88 70.88 70.88 ZT16-19 60.181111109999996 60.181111109999996 60.181111109999996 ZT20-23 70.67888889 70.67888889 70.67888889