condition mean min max ZT0-3 11.453631 11.453631 11.453631 ZT4-7 12.1137125 12.1137125 12.1137125 ZT8-11 12.804468 12.804468 12.804468 ZT12-15 11.225012 11.225012 11.225012 ZT16-19 12.081726499999998 12.081726499999998 12.081726499999998 ZT20-23 11.938489 11.938489 11.938489