condition mean min max ZT0-3 21.7 21.7 21.7 ZT4-7 22.7 22.7 22.7 ZT8-11 14.25 14.25 14.25 ZT12-15 10.75 10.75 10.75 ZT16-19 34.2 34.2 34.2 ZT20-23 34.5 34.5 34.5