condition mean min max ZT0-3 9.932793 9.932793 9.932793 ZT4-7 9.254613 9.254613 9.254613 ZT8-11 10.6739245 10.6739245 10.6739245 ZT12-15 10.465103 10.465103 10.465103 ZT16-19 12.965874 12.965874 12.965874 ZT20-23 10.223961 10.223961 10.223961