condition mean min max ZT0-3 10.3539 10.3539 10.3539 ZT4-7 7.835585 7.835585 7.835585 ZT8-11 8.07863 8.07863 8.07863 ZT12-15 9.651375 9.651375 9.651375 ZT16-19 10.16162 10.16162 10.16162 ZT20-23 10.001315 10.001315 10.001315