condition mean min max ZT0-3 16.22263 16.22263 16.22263 ZT4-7 11.038941 11.038941 11.038941 ZT8-11 11.359859499999999 11.359859499999999 11.359859499999999 ZT12-15 10.427436499999999 10.427436499999999 10.427436499999999 ZT16-19 11.8902645 11.8902645 11.8902645 ZT20-23 12.597113499999999 12.597113499999999 12.597113499999999