condition mean min max ZT0-3 21.83445 19.703899999999997 24.18325 ZT4-7 19.9462 19.9462 19.9462 ZT8-11 30.5922 30.5922 30.5922 ZT12-15 27.08925 24.85565 29.32285 ZT16-19 19.9955 19.9955 19.9955 ZT20-23 22.77385 22.77385 22.77385