condition mean min max ZT0-3 22.117933333333333 20.17435 25.9464 ZT4-7 23.52465 23.52465 23.52465 ZT8-11 46.662549999999996 46.662549999999996 46.662549999999996 ZT12-15 34.604949999999995 29.57265 39.637249999999995 ZT16-19 26.14385 26.14385 26.14385 ZT20-23 35.58735 35.58735 35.58735