condition mean min max ZT0-3 179.033089 179.033089 179.033089 ZT4-7 137.6964765 137.6964765 137.6964765 ZT8-11 175.181273 175.181273 175.181273 ZT12-15 207.2747195 207.2747195 207.2747195 ZT16-19 287.226273 287.226273 287.226273 ZT20-23 157.34905700000002 157.34905700000002 157.34905700000002