condition mean min max ZT0-3 26.66285 26.66285 26.66285 ZT4-7 17.48885 17.48885 17.48885 ZT8-11 13.15766 13.15766 13.15766 ZT12-15 5.776505 5.776505 5.776505 ZT16-19 21.124000000000002 21.124000000000002 21.124000000000002 ZT20-23 41.9109 41.9109 41.9109