condition mean min max ZT0-3 0.3724598333333334 0.250118 0.47921600000000003 ZT4-7 0.279178 0.279178 0.279178 ZT8-11 0.6274715 0.6274715 0.6274715 ZT12-15 1.5481274999999999 1.506735 1.5895199999999998 ZT16-19 1.5219749999999999 1.5219749999999999 1.5219749999999999 ZT20-23 0.9428955 0.9428955 0.9428955