condition mean min max ZT0-3 21.8 21.8 21.8 ZT4-7 15.7 15.7 15.7 ZT8-11 10.75 10.75 10.75 ZT12-15 42.15 42.15 42.15 ZT16-19 15.25 15.25 15.25 ZT20-23 14.5 14.5 14.5