condition mean min max ZT0-3 46.492675 40.2076 52.77775 ZT4-7 77.2737 77.2737 77.2737 ZT8-11 96.78045 96.78045 96.78045 ZT12-15 0 0 0 ZT16-19 102.1955 102.1955 102.1955 ZT20-23 91.6786 91.6786 91.6786