condition mean min max ZT0-3 4.9 4.9 4.9 ZT4-7 32.6 32.6 32.6 ZT8-11 36.6 36.6 36.6 ZT12-15 10.55 10.55 10.55 ZT16-19 28.25 28.25 28.25 ZT20-23 19.6 19.6 19.6