condition mean min max ZT0-3 1261.157972 1261.157972 1261.157972 ZT4-7 1085.2712434999999 1085.2712434999999 1085.2712434999999 ZT8-11 555.090029 555.090029 555.090029 ZT12-15 455.5669645 455.5669645 455.5669645 ZT16-19 327.4167355 327.4167355 327.4167355 ZT20-23 712.2949619999999 712.2949619999999 712.2949619999999