condition mean min max ZT0-3 29.59845 29.59845 29.59845 ZT4-7 14.853349999999999 14.853349999999999 14.853349999999999 ZT8-11 9.888325 9.888325 9.888325 ZT12-15 8.729855 8.729855 8.729855 ZT16-19 28.201749999999997 28.201749999999997 28.201749999999997 ZT20-23 23.306800000000003 23.306800000000003 23.306800000000003