condition mean min max ZT0-3 12.200199999999999 12.200199999999999 12.200199999999999 ZT4-7 6.876245 6.876245 6.876245 ZT8-11 11.24915 11.24915 11.24915 ZT12-15 11.73125 11.73125 11.73125 ZT16-19 16.1977 16.1977 16.1977 ZT20-23 13.6186 13.6186 13.6186