condition mean min max ZT0-3 73.065231 73.065231 73.065231 ZT4-7 62.793238 62.793238 62.793238 ZT8-11 75.835858 75.835858 75.835858 ZT12-15 214.087634 214.087634 214.087634 ZT16-19 127.9800205 127.9800205 127.9800205 ZT20-23 558.390898 558.390898 558.390898