condition mean min max ZT0-3 3.7803816666666665 1.6679149999999998 4.86265 ZT4-7 2.7940449999999997 2.7940449999999997 2.7940449999999997 ZT8-11 1.738865 1.738865 1.738865 ZT12-15 6.715882499999999 3.1872 10.244565 ZT16-19 7.127575 7.127575 7.127575 ZT20-23 4.29295 4.29295 4.29295