condition mean min max ZT0-3 1186.221761 1186.221761 1186.221761 ZT4-7 648.4460839999999 648.4460839999999 648.4460839999999 ZT8-11 269.223219 269.223219 269.223219 ZT12-15 197.024475 197.024475 197.024475 ZT16-19 242.08202699999998 242.08202699999998 242.08202699999998 ZT20-23 290.7702475 290.7702475 290.7702475