condition mean min max ZT0-3 103.944276 103.944276 103.944276 ZT4-7 111.6657525 111.6657525 111.6657525 ZT8-11 153.278085 153.278085 153.278085 ZT12-15 215.82804299999998 215.82804299999998 215.82804299999998 ZT16-19 139.851122 139.851122 139.851122 ZT20-23 250.232443 250.232443 250.232443