condition mean min max ZT0-3 63.08938333333334 48.92835 82.9637 ZT4-7 69.38804999999999 69.38804999999999 69.38804999999999 ZT8-11 75.30359999999999 75.30359999999999 75.30359999999999 ZT12-15 56.219775 54.3888 58.05075 ZT16-19 43.3665 43.3665 43.3665 ZT20-23 37.76035 37.76035 37.76035