condition mean min max ZT0-3 12.809504148999999 9.612645803 16.006362494999998 ZT4-7 14.1660527575 13.998791675 14.333313839999999 ZT8-11 17.64931362 15.249998075 20.048629165 ZT12-15 17.5610021775 17.206362705 17.915641649999998 ZT16-19 16.7959642175 16.664829555 16.92709888 ZT20-23 17.5297796575 16.70744338 18.352115935