condition mean min max ZT0-3 5.6085675 5.056055000000001 6.16108 ZT4-7 10.344285 10.344285 10.344285 ZT8-11 6.273595 6.273595 6.273595 ZT12-15 0 0 0 ZT16-19 8.996335 8.996335 8.996335 ZT20-23 9.290495 9.290495 9.290495