condition mean min max ZT0-3 54.099999999999994 54.099999999999994 54.099999999999994 ZT4-7 33.0 33.0 33.0 ZT8-11 35.5 35.5 35.5 ZT12-15 20.7 20.7 20.7 ZT16-19 70.45 70.45 70.45 ZT20-23 49.0 49.0 49.0