condition mean min max ZT0-3 162.001288 162.001288 162.001288 ZT4-7 165.381914 165.381914 165.381914 ZT8-11 164.287609 164.287609 164.287609 ZT12-15 190.358978 190.358978 190.358978 ZT16-19 236.7222595 236.7222595 236.7222595 ZT20-23 192.3514455 192.3514455 192.3514455