condition mean min max ZT0-3 5.5 5.5 5.5 ZT4-7 32.2 32.2 32.2 ZT8-11 41.7 41.7 41.7 ZT12-15 26.4 26.4 26.4 ZT16-19 22.7 22.7 22.7 ZT20-23 27.6 27.6 27.6