condition mean min max ZT0-3 5.909432499999999 5.902825 5.91604 ZT4-7 3.506285 3.506285 3.506285 ZT8-11 3.3317050000000004 3.3317050000000004 3.3317050000000004 ZT12-15 0 0 0 ZT16-19 4.056335 4.056335 4.056335 ZT20-23 6.08489 6.08489 6.08489