condition mean min max ZT0-3 32.5 32.5 32.5 ZT4-7 6.2 6.2 6.2 ZT8-11 33.4 33.4 33.4 ZT12-15 36.5 36.5 36.5 ZT16-19 33.5 33.5 33.5 ZT20-23 21.7 21.7 21.7