condition mean min max ZT0-3 82.254861 82.254861 82.254861 ZT4-7 81.159401 81.159401 81.159401 ZT8-11 77.7392155 77.7392155 77.7392155 ZT12-15 77.1730185 77.1730185 77.1730185 ZT16-19 69.170597 69.170597 69.170597 ZT20-23 52.843456 52.843456 52.843456