condition mean min max ZT0-3 19.65 19.65 19.65 ZT4-7 18.1 18.1 18.1 ZT8-11 6.1 6.1 6.1 ZT12-15 44.5 44.5 44.5 ZT16-19 6.25 6.25 6.25 ZT20-23 33.85 33.85 33.85