condition mean min max ZT0-3 31.07760629 25.71323121 36.44198137 ZT4-7 34.8972233275 30.675134415000002 39.11931224 ZT8-11 46.35569174 37.514243535 55.197139945 ZT12-15 76.22026135249999 74.364113085 78.07640961999999 ZT16-19 73.8190834025 69.827890795 77.81027601 ZT20-23 55.0139886125 52.77995691 57.248020315000005