condition mean min max ZT0-3 41.4754 13.69915 56.40995 ZT4-7 12.38205 12.38205 12.38205 ZT8-11 11.2896 11.2896 11.2896 ZT12-15 17.22415 14.0703 20.378 ZT16-19 26.2712 26.2712 26.2712 ZT20-23 46.635450000000006 46.635450000000006 46.635450000000006