condition mean min max ZT0-3 3.1949944002500006 2.8816552210000004 3.5083335795000004 ZT4-7 2.690375209 2.5765302715000002 2.8042201464999996 ZT8-11 2.9870343005 2.838836411 3.13523219 ZT12-15 5.3096914457499995 4.210231018 6.4091518735 ZT16-19 6.87023695 6.0505101045 7.6899637955 ZT20-23 12.452719527500001 10.73916376 14.166275295