condition mean min max ZT0-3 0.01915421275 0.0 0.0383084255 ZT4-7 1.004311616 0.39087146 1.617751772 ZT8-11 6.0207383765 5.7648981704999995 6.2765785825 ZT12-15 21.56592741775 15.7479243355 27.383930499999998 ZT16-19 13.961830155 13.059240805 14.864419504999999 ZT20-23 14.122153455 13.981948095 14.262358815