condition mean min max ZT0-3 13.130600000000001 13.001650000000001 13.25955 ZT4-7 12.94575 12.94575 12.94575 ZT8-11 12.91525 12.91525 12.91525 ZT12-15 0 0 0 ZT16-19 15.331299999999999 15.331299999999999 15.331299999999999 ZT20-23 17.2704 17.2704 17.2704