condition mean min max ZT0-3 7.1178325000000005 1.80614 12.429525000000002 ZT4-7 9.082455 9.082455 9.082455 ZT8-11 9.03778 9.03778 9.03778 ZT12-15 0 0 0 ZT16-19 14.24695 14.24695 14.24695 ZT20-23 19.627000000000002 19.627000000000002 19.627000000000002