condition mean min max ZT0-3 40.8 40.8 40.8 ZT4-7 22.1 22.1 22.1 ZT8-11 14.25 14.25 14.25 ZT12-15 64.9 64.9 64.9 ZT16-19 61.099999999999994 61.099999999999994 61.099999999999994 ZT20-23 16.9 16.9 16.9