condition mean min max ZT0-3 9.707831 9.707831 9.707831 ZT4-7 9.1421265 9.1421265 9.1421265 ZT8-11 10.35959 10.35959 10.35959 ZT12-15 9.572453 9.572453 9.572453 ZT16-19 9.238934 9.238934 9.238934 ZT20-23 10.096788499999999 10.096788499999999 10.096788499999999