condition mean min max ZT0-3 0.22203325000000002 0.0871335 0.356933 ZT4-7 0.3547015 0.3547015 0.3547015 ZT8-11 0.3555235 0.3555235 0.3555235 ZT12-15 0 0 0 ZT16-19 0.439036 0.439036 0.439036 ZT20-23 0.707199 0.707199 0.707199