condition mean min max ZT0-3 9.489090000000001 9.489090000000001 9.489090000000001 ZT4-7 3.72651 3.72651 3.72651 ZT8-11 3.3293850000000003 3.3293850000000003 3.3293850000000003 ZT12-15 3.646425 3.646425 3.646425 ZT16-19 8.002825 8.002825 8.002825 ZT20-23 10.73015 10.73015 10.73015