condition mean min max ZT0-3 1.1033418333333334 0.6868855 1.3580800000000002 ZT4-7 1.7821349999999998 1.7821349999999998 1.7821349999999998 ZT8-11 6.302255000000001 6.302255000000001 6.302255000000001 ZT12-15 7.9678325 6.6278749999999995 9.30779 ZT16-19 3.66283 3.66283 3.66283 ZT20-23 2.39861 2.39861 2.39861