condition mean min max ZT0-3 9.319514784333332 8.665325154 9.973704414666667 ZT4-7 10.361105265666666 9.815678324333334 10.906532207 ZT8-11 11.411870211 11.096385958 11.727354464 ZT12-15 13.1339821815 12.928377166333334 13.339587196666667 ZT16-19 11.5742183645 10.426188698999999 12.722248030000001 ZT20-23 10.552588960166666 10.155942331 10.949235589333334