condition mean min max ZT0-3 33.0 33.0 33.0 ZT4-7 31.3 31.3 31.3 ZT8-11 33.55 33.55 33.55 ZT12-15 42.25 42.25 42.25 ZT16-19 42.65 42.65 42.65 ZT20-23 61.75 61.75 61.75