condition mean min max ZT0-3 12.8208 12.49335 13.14825 ZT4-7 18.74845 18.74845 18.74845 ZT8-11 15.521149999999999 15.521149999999999 15.521149999999999 ZT12-15 0 0 0 ZT16-19 11.03355 11.03355 11.03355 ZT20-23 14.380500000000001 14.380500000000001 14.380500000000001