condition mean min max ZT0-3 24.326683333333335 23.4632 25.1981 ZT4-7 29.9217 29.9217 29.9217 ZT8-11 46.418049999999994 46.418049999999994 46.418049999999994 ZT12-15 57.60805 50.41445 64.80165 ZT16-19 56.18375 56.18375 56.18375 ZT20-23 26.7626 26.7626 26.7626