condition mean min max ZT0-3 0.24157196325 0.18521878749999998 0.297925139 ZT4-7 0.249718486 0.19023382649999998 0.3092031455 ZT8-11 0.33631407125 0.2456096795 0.427018463 ZT12-15 0.32995293699999995 0.2004565795 0.45944929449999994 ZT16-19 0.64200266475 0.5241416235 0.759863706 ZT20-23 1.4583487575 1.1352775295 1.7814199855000001