condition mean min max ZT0-3 211.171713 211.171713 211.171713 ZT4-7 199.821666 199.821666 199.821666 ZT8-11 142.224777 142.224777 142.224777 ZT12-15 174.385903 174.385903 174.385903 ZT16-19 125.8628215 125.8628215 125.8628215 ZT20-23 176.688058 176.688058 176.688058