condition mean min max ZT0-3 21.858532 21.858532 21.858532 ZT4-7 24.082557 24.082557 24.082557 ZT8-11 23.742221 23.742221 23.742221 ZT12-15 20.713599000000002 20.713599000000002 20.713599000000002 ZT16-19 29.473952 29.473952 29.473952 ZT20-23 30.265901 30.265901 30.265901