condition mean min max ZT0-3 7.65 7.65 7.65 ZT4-7 16.7 16.7 16.7 ZT8-11 41.35 41.35 41.35 ZT12-15 5.4 5.4 5.4 ZT16-19 4.75 4.75 4.75 ZT20-23 5.2 5.2 5.2