condition mean min max ZT0-3 42.229675 42.223749999999995 42.235600000000005 ZT4-7 57.4214 57.4214 57.4214 ZT8-11 54.888450000000006 54.888450000000006 54.888450000000006 ZT12-15 0 0 0 ZT16-19 53.737049999999996 53.737049999999996 53.737049999999996 ZT20-23 45.27375 45.27375 45.27375