condition mean min max ZT0-3 36.872759 36.872759 36.872759 ZT4-7 38.1968575 38.1968575 38.1968575 ZT8-11 31.1524995 31.1524995 31.1524995 ZT12-15 32.364362 32.364362 32.364362 ZT16-19 36.15227 36.15227 36.15227 ZT20-23 35.8806515 35.8806515 35.8806515