condition mean min max ZT0-3 22.9869 20.56555 25.40825 ZT4-7 6.381030000000001 6.381030000000001 6.381030000000001 ZT8-11 9.97943 9.97943 9.97943 ZT12-15 0 0 0 ZT16-19 21.65465 21.65465 21.65465 ZT20-23 5.224315 5.224315 5.224315