condition mean min max ZT0-3 5.548133333333333 2.708985 7.465375 ZT4-7 2.608495 2.608495 2.608495 ZT8-11 2.999945 2.999945 2.999945 ZT12-15 3.82269 3.16929 4.47609 ZT16-19 3.4543549999999996 3.4543549999999996 3.4543549999999996 ZT20-23 8.37511 8.37511 8.37511