condition mean min max ZT0-3 1.1231485 1.077817 1.16848 ZT4-7 0.7535915 0.7535915 0.7535915 ZT8-11 0.432158 0.432158 0.432158 ZT12-15 0 0 0 ZT16-19 1.0584885 1.0584885 1.0584885 ZT20-23 1.38361 1.38361 1.38361