condition mean min max ZT0-3 2.0708575 1.916545 2.22517 ZT4-7 1.61246 1.61246 1.61246 ZT8-11 3.009795 3.009795 3.009795 ZT12-15 0 0 0 ZT16-19 3.419385 3.419385 3.419385 ZT20-23 2.830825 2.830825 2.830825