condition mean min max ZT0-3 158.856028 158.856028 158.856028 ZT4-7 46.219922 46.219922 46.219922 ZT8-11 22.292006999999998 22.292006999999998 22.292006999999998 ZT12-15 15.6939335 15.6939335 15.6939335 ZT16-19 70.3443675 70.3443675 70.3443675 ZT20-23 137.5746955 137.5746955 137.5746955