condition mean min max ZT0-3 12.487487 12.487487 12.487487 ZT4-7 13.200193 13.200193 13.200193 ZT8-11 13.048594 13.048594 13.048594 ZT12-15 11.1999455 11.1999455 11.1999455 ZT16-19 10.256463 10.256463 10.256463 ZT20-23 11.495149 11.495149 11.495149