condition mean min max ZT0-3 15.871849999999998 8.54735 22.1391 ZT4-7 15.4189 15.4189 15.4189 ZT8-11 11.37495 11.37495 11.37495 ZT12-15 15.8841 14.854500000000002 16.9137 ZT16-19 18.24595 18.24595 18.24595 ZT20-23 25.0321 25.0321 25.0321