condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0160782 0.0160782 0.0160782 ZT16-19 0.155799 0.155799 0.155799 ZT20-23 0.175759 0.175759 0.175759