condition mean min max ZT0-3 43.25 43.25 43.25 ZT4-7 64.1 64.1 64.1 ZT8-11 35.05 35.05 35.05 ZT12-15 28.2 28.2 28.2 ZT16-19 27.549999999999997 27.549999999999997 27.549999999999997 ZT20-23 26.2 26.2 26.2