condition mean min max ZT0-3 5.5937375 5.272115 5.91536 ZT4-7 5.1621749999999995 5.1621749999999995 5.1621749999999995 ZT8-11 9.97424 9.97424 9.97424 ZT12-15 0 0 0 ZT16-19 10.7005 10.7005 10.7005 ZT20-23 6.702605 6.702605 6.702605