condition mean min max ZT0-3 10.778564 10.778564 10.778564 ZT4-7 11.805043 11.805043 11.805043 ZT8-11 14.2087475 14.2087475 14.2087475 ZT12-15 11.478792 11.478792 11.478792 ZT16-19 11.805043 11.805043 11.805043 ZT20-23 10.785720999999999 10.785720999999999 10.785720999999999