condition mean min max ZT0-3 62.511700000000005 56.87795 68.14545000000001 ZT4-7 50.051649999999995 50.051649999999995 50.051649999999995 ZT8-11 45.808949999999996 45.808949999999996 45.808949999999996 ZT12-15 0 0 0 ZT16-19 69.00465 69.00465 69.00465 ZT20-23 66.514 66.514 66.514