condition mean min max ZT0-3 26.783475 23.16415 30.4028 ZT4-7 64.4837 64.4837 64.4837 ZT8-11 116.32900000000001 116.32900000000001 116.32900000000001 ZT12-15 0 0 0 ZT16-19 115.52125 115.52125 115.52125 ZT20-23 49.790800000000004 49.790800000000004 49.790800000000004