condition mean min max ZT0-3 17.699512067500002 15.213390900000002 20.185633235 ZT4-7 19.4406078725 19.434987024999998 19.44622872 ZT8-11 26.1586929175 21.25606279 31.061323045 ZT12-15 64.8618437925 55.160816435 74.56287115 ZT16-19 63.6340045375 59.740291299999996 67.527717775 ZT20-23 40.961593259999994 38.12456783499999 43.798618684999994