condition mean min max ZT0-3 5.85 5.85 5.85 ZT4-7 20.4 20.4 20.4 ZT8-11 12.2 12.2 12.2 ZT12-15 5.4 5.4 5.4 ZT16-19 4.3 4.3 4.3 ZT20-23 28.099999999999998 28.099999999999998 28.099999999999998