condition mean min max ZT0-3 11.704194 11.704194 11.704194 ZT4-7 12.047411 12.047411 12.047411 ZT8-11 11.584448 11.584448 11.584448 ZT12-15 11.611707500000001 11.611707500000001 11.611707500000001 ZT16-19 13.1409995 13.1409995 13.1409995 ZT20-23 12.5929675 12.5929675 12.5929675