condition mean min max ZT0-3 22.15 22.15 22.15 ZT4-7 17.4 17.4 17.4 ZT8-11 14.15 14.15 14.15 ZT12-15 18.5 18.5 18.5 ZT16-19 3.85 3.85 3.85 ZT20-23 10.5 10.5 10.5