condition mean min max ZT0-3 3.254506666666667 3.254506666666667 3.254506666666667 ZT4-7 4.7274650000000005 4.7274650000000005 4.7274650000000005 ZT8-11 15.624500000000001 15.624500000000001 15.624500000000001 ZT12-15 61.28675 61.28675 61.28675 ZT16-19 15.8354 15.8354 15.8354 ZT20-23 6.2664 6.2664 6.2664