condition mean min max ZT0-3 0.7515477500000001 0.3178255 1.18527 ZT4-7 0.215819 0.215819 0.215819 ZT8-11 0.3225795 0.3225795 0.3225795 ZT12-15 0 0 0 ZT16-19 0.5294530000000001 0.5294530000000001 0.5294530000000001 ZT20-23 1.17068 1.17068 1.17068