condition mean min max ZT0-3 71.4 71.4 71.4 ZT4-7 76.6 76.6 76.6 ZT8-11 55.3 55.3 55.3 ZT12-15 78.7 78.7 78.7 ZT16-19 57.099999999999994 57.099999999999994 57.099999999999994 ZT20-23 44.3 44.3 44.3