condition mean min max ZT0-3 21.4535 21.4535 21.4535 ZT4-7 20.087699999999998 20.087699999999998 20.087699999999998 ZT8-11 21.61985 21.61985 21.61985 ZT12-15 16.82735 16.82735 16.82735 ZT16-19 21.9093 21.9093 21.9093 ZT20-23 19.25125 19.25125 19.25125