condition mean min max ZT0-3 67.694972 67.694972 67.694972 ZT4-7 60.894825499999996 60.894825499999996 60.894825499999996 ZT8-11 61.0149815 61.0149815 61.0149815 ZT12-15 75.0878295 75.0878295 75.0878295 ZT16-19 88.1950595 88.1950595 88.1950595 ZT20-23 86.476495 86.476495 86.476495