condition mean min max ZT0-3 31.164500000000004 31.164500000000004 31.164500000000004 ZT4-7 22.575000000000003 22.575000000000003 22.575000000000003 ZT8-11 13.92665 13.92665 13.92665 ZT12-15 16.16845 16.16845 16.16845 ZT16-19 26.207900000000002 26.207900000000002 26.207900000000002 ZT20-23 32.129099999999994 32.129099999999994 32.129099999999994