condition mean min max ZT0-3 46.293404 46.293404 46.293404 ZT4-7 41.1153865 41.1153865 41.1153865 ZT8-11 47.449385500000005 47.449385500000005 47.449385500000005 ZT12-15 53.3351395 53.3351395 53.3351395 ZT16-19 60.1180635 60.1180635 60.1180635 ZT20-23 65.6530255 65.6530255 65.6530255