condition mean min max ZT0-3 37.3307 37.3307 37.3307 ZT4-7 28.395449999999997 28.395449999999997 28.395449999999997 ZT8-11 16.63775 16.63775 16.63775 ZT12-15 18.624000000000002 18.624000000000002 18.624000000000002 ZT16-19 29.4139 29.4139 29.4139 ZT20-23 35.673066666666664 35.673066666666664 35.673066666666664