condition mean min max ZT0-3 40.5531588975 37.75415647 43.352161325 ZT4-7 41.385827715 38.381004186666665 44.39065124333333 ZT8-11 41.33917219999999 39.53321979 43.145124609999996 ZT12-15 39.723746805000005 36.05017178 43.39732183 ZT16-19 39.42262760166667 37.36729527 41.47795993333334 ZT20-23 40.453453206666666 39.2944076 41.61249881333333