condition mean min max ZT0-3 26.4 26.4 26.4 ZT4-7 8.9 8.9 8.9 ZT8-11 24.25 24.25 24.25 ZT12-15 14.5 14.5 14.5 ZT16-19 22.25 22.25 22.25 ZT20-23 17.15 17.15 17.15