condition mean min max ZT0-3 12.72874 12.72874 12.72874 ZT4-7 21.3167195 21.3167195 21.3167195 ZT8-11 19.621457 19.621457 19.621457 ZT12-15 18.811249500000002 18.811249500000002 18.811249500000002 ZT16-19 15.4428005 15.4428005 15.4428005 ZT20-23 11.4880775 11.4880775 11.4880775