condition mean min max ZT0-3 142.109631 142.109631 142.109631 ZT4-7 93.340792 93.340792 93.340792 ZT8-11 89.237559 89.237559 89.237559 ZT12-15 87.9300035 87.9300035 87.9300035 ZT16-19 64.8443 64.8443 64.8443 ZT20-23 75.6176675 75.6176675 75.6176675