condition mean min max ZT0-3 2.9484975 2.932035 2.96496 ZT4-7 2.40027 2.40027 2.40027 ZT8-11 5.3314 5.3314 5.3314 ZT12-15 0 0 0 ZT16-19 5.13713 5.13713 5.13713 ZT20-23 2.686045 2.686045 2.686045