condition mean min max ZT0-3 55.0 55.0 55.0 ZT4-7 67.2 67.2 67.2 ZT8-11 53.5 53.5 53.5 ZT12-15 89.44999999999999 89.44999999999999 89.44999999999999 ZT16-19 98.75 98.75 98.75 ZT20-23 86.45 86.45 86.45