condition mean min max ZT0-3 12.3266 11.7157 12.9375 ZT4-7 7.1793 7.1793 7.1793 ZT8-11 5.267585 5.267585 5.267585 ZT12-15 0 0 0 ZT16-19 9.615 9.615 9.615 ZT20-23 8.987015 8.987015 8.987015