condition mean min max ZT0-3 2.5564220752500004 1.7251722945 3.3876718560000003 ZT4-7 1.0540058920000002 0.9376895045 1.1703222795000001 ZT8-11 1.3828185404999997 0.7020527894999999 2.0635842915 ZT12-15 5.558585593250001 3.0382967805000005 8.078874406 ZT16-19 13.58791968775 10.566893505500001 16.60894587 ZT20-23 28.431152887499998 21.35554182 35.506763955