condition mean min max ZT0-3 55.249395 55.249395 55.249395 ZT4-7 29.6574795 29.6574795 29.6574795 ZT8-11 17.5786905 17.5786905 17.5786905 ZT12-15 22.417196 22.417196 22.417196 ZT16-19 13.9781105 13.9781105 13.9781105 ZT20-23 14.3420935 14.3420935 14.3420935