condition mean min max ZT0-3 177.028888 177.028888 177.028888 ZT4-7 214.4376135 214.4376135 214.4376135 ZT8-11 206.56836800000002 206.56836800000002 206.56836800000002 ZT12-15 227.04655150000002 227.04655150000002 227.04655150000002 ZT16-19 207.239824 207.239824 207.239824 ZT20-23 229.77920999999998 229.77920999999998 229.77920999999998