condition mean min max ZT0-3 53.05651666666667 42.81645 59.52305 ZT4-7 49.44815 49.44815 49.44815 ZT8-11 51.84415 51.84415 51.84415 ZT12-15 51.8786 51.3186 52.438599999999994 ZT16-19 53.24105 53.24105 53.24105 ZT20-23 63.1389 63.1389 63.1389