condition mean min max ZT0-3 618.507518 618.507518 618.507518 ZT4-7 370.551457 370.551457 370.551457 ZT8-11 322.6340105 322.6340105 322.6340105 ZT12-15 411.03541600000005 411.03541600000005 411.03541600000005 ZT16-19 642.521935 642.521935 642.521935 ZT20-23 767.8180505 767.8180505 767.8180505