condition mean min max ZT0-3 0.7819068333333333 0.6730835 0.9432115000000001 ZT4-7 0.1662345 0.1662345 0.1662345 ZT8-11 1.3928875 1.3928875 1.3928875 ZT12-15 0.90658375 0.351093 1.4620745 ZT16-19 1.0528149999999998 1.0528149999999998 1.0528149999999998 ZT20-23 2.221225 2.221225 2.221225