condition mean min max ZT0-3 555.451998 555.451998 555.451998 ZT4-7 253.91427449999998 253.91427449999998 253.91427449999998 ZT8-11 48.681893 48.681893 48.681893 ZT12-15 57.264196500000004 57.264196500000004 57.264196500000004 ZT16-19 30.2460085 30.2460085 30.2460085 ZT20-23 24.191838 24.191838 24.191838