condition mean min max ZT0-3 53.56516666666667 33.619550000000004 67.59135 ZT4-7 24.5283 24.5283 24.5283 ZT8-11 23.5482 23.5482 23.5482 ZT12-15 54.940524999999994 52.925349999999995 56.95569999999999 ZT16-19 50.69785 50.69785 50.69785 ZT20-23 74.0079 74.0079 74.0079