condition mean min max ZT0-3 78.59174672500001 76.03997683 81.14351662 ZT4-7 42.58360004 38.137319875 47.029880205 ZT8-11 31.473325365 27.23537379 35.71127694 ZT12-15 66.4158825625 60.949658740000004 71.882106385 ZT16-19 80.99221589749999 80.00683169 81.977600105 ZT20-23 91.0887939875 88.476525245 93.70106272999999