condition mean min max ZT0-3 62.836065 62.836065 62.836065 ZT4-7 42.4129515 42.4129515 42.4129515 ZT8-11 24.6104665 24.6104665 24.6104665 ZT12-15 18.6858005 18.6858005 18.6858005 ZT16-19 10.625981 10.625981 10.625981 ZT20-23 15.451224499999999 15.451224499999999 15.451224499999999