condition mean min max ZT0-3 198.548678 198.548678 198.548678 ZT4-7 227.34835950000002 227.34835950000002 227.34835950000002 ZT8-11 154.612046 154.612046 154.612046 ZT12-15 122.094641 122.094641 122.094641 ZT16-19 96.03982099999999 96.03982099999999 96.03982099999999 ZT20-23 79.9146215 79.9146215 79.9146215