condition mean min max ZT0-3 12.270575000000001 11.8945 12.646650000000001 ZT4-7 7.86927 7.86927 7.86927 ZT8-11 6.49707 6.49707 6.49707 ZT12-15 0 0 0 ZT16-19 12.46635 12.46635 12.46635 ZT20-23 16.07785 16.07785 16.07785