condition mean min max ZT0-3 1.6822058333333332 1.0795375 2.4100099999999998 ZT4-7 2.7186899999999996 2.7186899999999996 2.7186899999999996 ZT8-11 2.2187650000000003 2.2187650000000003 2.2187650000000003 ZT12-15 2.7449975 2.26316 3.226835 ZT16-19 2.183515 2.183515 2.183515 ZT20-23 2.112325 2.112325 2.112325