condition mean min max ZT0-3 4.344578333333334 2.83926 5.4744600000000005 ZT4-7 1.8623699999999999 1.8623699999999999 1.8623699999999999 ZT8-11 2.0491650000000003 2.0491650000000003 2.0491650000000003 ZT12-15 4.4380825 4.316155 4.56001 ZT16-19 3.98457 3.98457 3.98457 ZT20-23 5.69247 5.69247 5.69247