condition mean min max ZT0-3 8.542815000000001 8.542815000000001 8.542815000000001 ZT4-7 15.191933333333333 15.191933333333333 15.191933333333333 ZT8-11 15.741665000000001 15.741665000000001 15.741665000000001 ZT12-15 18.4095 18.4095 18.4095 ZT16-19 20.1692 20.1692 20.1692 ZT20-23 11.284235 11.284235 11.284235