condition mean min max ZT0-3 27.771691046500003 11.233974743000001 44.30940735 ZT4-7 12.46197929575 10.3469729165 14.576985675 ZT8-11 12.6863567525 12.170058505 13.202655 ZT12-15 14.872703049 12.66774719 17.077658908 ZT16-19 11.833195859749999 9.9485453695 13.71784635 ZT20-23 19.228204267499997 17.613209955 20.84319858