condition mean min max ZT0-3 298.143686 298.143686 298.143686 ZT4-7 253.398127 253.398127 253.398127 ZT8-11 100.99705499999999 100.99705499999999 100.99705499999999 ZT12-15 35.5995015 35.5995015 35.5995015 ZT16-19 154.023786 154.023786 154.023786 ZT20-23 300.65194099999997 300.65194099999997 300.65194099999997