condition mean min max ZT0-3 52.628675 52.628675 52.628675 ZT4-7 54.458725 54.458725 54.458725 ZT8-11 55.09558333333334 55.09558333333334 55.09558333333334 ZT12-15 50.454575 50.454575 50.454575 ZT16-19 50.9912 50.9912 50.9912 ZT20-23 48.753499999999995 48.753499999999995 48.753499999999995