condition mean min max ZT0-3 57.458202 57.458202 57.458202 ZT4-7 68.8496645 68.8496645 68.8496645 ZT8-11 62.629876499999995 62.629876499999995 62.629876499999995 ZT12-15 65.7507465 65.7507465 65.7507465 ZT16-19 71.3358585 71.3358585 71.3358585 ZT20-23 79.75366700000001 79.75366700000001 79.75366700000001