condition mean min max ZT0-3 276.622413 276.622413 276.622413 ZT4-7 668.6379485 668.6379485 668.6379485 ZT8-11 571.6372094999999 571.6372094999999 571.6372094999999 ZT12-15 458.8918745 458.8918745 458.8918745 ZT16-19 366.3191455 366.3191455 366.3191455 ZT20-23 325.359261 325.359261 325.359261