condition mean min max ZT0-3 0.508502 0.508502 0.508502 ZT4-7 0.514475 0.514475 0.514475 ZT8-11 0.25765150000000003 0.25765150000000003 0.25765150000000003 ZT12-15 0.2608955 0.2608955 0.2608955 ZT16-19 0.396158 0.396158 0.396158 ZT20-23 0.3375505 0.3375505 0.3375505