condition mean min max ZT0-3 1.7364448879999999 1.184353762 2.288536014 ZT4-7 2.428407729 1.84228028 3.014535178 ZT8-11 1.5308478822499998 0.983719209 2.0779765555 ZT12-15 2.94267277775 1.667092879 4.2182526765 ZT16-19 4.48646976325 4.412705053 4.5602344735 ZT20-23 4.6119684195 4.2418810525 4.9820557865