condition mean min max ZT0-3 12.843121666666667 10.373365 16.9563 ZT4-7 16.01175 16.01175 16.01175 ZT8-11 11.8674 11.8674 11.8674 ZT12-15 13.506625 13.150549999999999 13.8627 ZT16-19 10.29485 10.29485 10.29485 ZT20-23 8.838165 8.838165 8.838165