condition mean min max ZT0-3 17.8413 15.269499999999999 20.4131 ZT4-7 12.918800000000001 12.918800000000001 12.918800000000001 ZT8-11 9.283085 9.283085 9.283085 ZT12-15 0 0 0 ZT16-19 10.215724999999999 10.215724999999999 10.215724999999999 ZT20-23 11.9139 11.9139 11.9139