condition mean min max ZT0-3 3.0116516666666664 1.87534 4.827204999999999 ZT4-7 2.84787 2.84787 2.84787 ZT8-11 3.162425 3.162425 3.162425 ZT12-15 3.84933 2.349145 5.349515 ZT16-19 8.24257 8.24257 8.24257 ZT20-23 6.305485 6.305485 6.305485