condition mean min max ZT0-3 22.198266666666665 14.595099999999999 26.06195 ZT4-7 6.071625 6.071625 6.071625 ZT8-11 5.234855 5.234855 5.234855 ZT12-15 18.437275 17.05515 19.8194 ZT16-19 13.973849999999999 13.973849999999999 13.973849999999999 ZT20-23 24.557949999999998 24.557949999999998 24.557949999999998