condition mean min max ZT0-3 11.423121 11.423121 11.423121 ZT4-7 9.649718499999999 9.649718499999999 9.649718499999999 ZT8-11 9.805382999999999 9.805382999999999 9.805382999999999 ZT12-15 12.9586665 12.9586665 12.9586665 ZT16-19 11.9063135 11.9063135 11.9063135 ZT20-23 13.468430000000001 13.468430000000001 13.468430000000001