condition mean min max ZT0-3 45.328323365 39.0642711 51.59237563 ZT4-7 19.07449149 18.28626263 19.86272035 ZT8-11 27.267863175 23.333239685 31.202486665 ZT12-15 27.4275852975 26.05158074 28.803589855 ZT16-19 24.821820549999998 22.595294255 27.048346845 ZT20-23 29.683507995 28.905107985 30.461908004999998