condition mean min max ZT0-3 21.38975 15.3933 27.386200000000002 ZT4-7 15.922 15.922 15.922 ZT8-11 0.434853 0.434853 0.434853 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 8.45713 8.45713 8.45713