condition mean min max ZT0-3 27.9707648275 27.790756695 28.15077296 ZT4-7 10.6519596145 8.8155153895 12.4884038395 ZT8-11 9.89501165575 7.5201156795 12.269907631999999 ZT12-15 15.047804453000001 12.541605226 17.55400368 ZT16-19 18.8907993975 18.496114935 19.28548386 ZT20-23 25.303467649999998 23.848877809999998 26.75805749