condition mean min max ZT0-3 7.5958725000000005 4.358445 10.833300000000001 ZT4-7 8.06608 8.06608 8.06608 ZT8-11 4.033094999999999 4.033094999999999 4.033094999999999 ZT12-15 0 0 0 ZT16-19 12.683 12.683 12.683 ZT20-23 10.67755 10.67755 10.67755