condition mean min max ZT0-3 144.701733 144.701733 144.701733 ZT4-7 170.2587935 170.2587935 170.2587935 ZT8-11 182.450987 182.450987 182.450987 ZT12-15 151.8151695 151.8151695 151.8151695 ZT16-19 151.168661 151.168661 151.168661 ZT20-23 141.30581949999998 141.30581949999998 141.30581949999998