condition mean min max ZT0-3 64.784902 64.784902 64.784902 ZT4-7 245.423202 245.423202 245.423202 ZT8-11 235.764609 235.764609 235.764609 ZT12-15 149.752245 149.752245 149.752245 ZT16-19 20.3218615 20.3218615 20.3218615 ZT20-23 12.785634 12.785634 12.785634