condition mean min max ZT0-3 78.090612 78.090612 78.090612 ZT4-7 127.8460085 127.8460085 127.8460085 ZT8-11 121.12977649999999 121.12977649999999 121.12977649999999 ZT12-15 103.2158815 103.2158815 103.2158815 ZT16-19 76.4340065 76.4340065 76.4340065 ZT20-23 61.4257515 61.4257515 61.4257515