condition mean min max ZT0-3 5.4717725 5.367935 5.57561 ZT4-7 7.844585 7.844585 7.844585 ZT8-11 10.344565 10.344565 10.344565 ZT12-15 0 0 0 ZT16-19 6.622915 6.622915 6.622915 ZT20-23 6.2419899999999995 6.2419899999999995 6.2419899999999995