condition mean min max ZT0-3 18.838682 18.838682 18.838682 ZT4-7 77.40805449999999 77.40805449999999 77.40805449999999 ZT8-11 85.6952835 85.6952835 85.6952835 ZT12-15 36.3009395 36.3009395 36.3009395 ZT16-19 15.606047 15.606047 15.606047 ZT20-23 17.370697 17.370697 17.370697