condition mean min max ZT0-3 26.290855 26.290855 26.290855 ZT4-7 46.081322 46.081322 46.081322 ZT8-11 31.7156135 31.7156135 31.7156135 ZT12-15 31.071485 31.071485 31.071485 ZT16-19 22.3234995 22.3234995 22.3234995 ZT20-23 21.4848815 21.4848815 21.4848815