condition mean min max ZT0-3 19.052300000000002 19.052300000000002 19.052300000000002 ZT4-7 15.239999999999998 15.239999999999998 15.239999999999998 ZT8-11 17.826999999999998 17.826999999999998 17.826999999999998 ZT12-15 20.247300000000003 20.247300000000003 20.247300000000003 ZT16-19 22.44235 22.44235 22.44235 ZT20-23 21.504649999999998 21.504649999999998 21.504649999999998