condition mean min max ZT0-3 31.2533 31.2533 31.2533 ZT4-7 21.880581499999998 21.880581499999998 21.880581499999998 ZT8-11 22.2456255 22.2456255 22.2456255 ZT12-15 45.254778 45.254778 45.254778 ZT16-19 31.283064 31.283064 31.283064 ZT20-23 58.635845 58.635845 58.635845