condition mean min max ZT0-3 4.35 4.35 4.35 ZT4-7 3.5 3.5 3.5 ZT8-11 4.4 4.4 4.4 ZT12-15 5.15 5.15 5.15 ZT16-19 16.75 16.75 16.75 ZT20-23 4.55 4.55 4.55