condition mean min max ZT0-3 0.87869643125 0.599725509 1.1576673535 ZT4-7 2.32747517625 1.9762562845000002 2.678694068 ZT8-11 4.49809046975 3.398963893 5.5972170465 ZT12-15 5.904889418 5.851343045 5.958435791 ZT16-19 4.4301093865 4.0029435215 4.857275251500001 ZT20-23 7.1673357455 6.0214689974999995 8.3132024935