condition mean min max ZT0-3 0.566453 0.421808 0.711098 ZT4-7 1.69005 1.69005 1.69005 ZT8-11 1.51165 1.51165 1.51165 ZT12-15 0 0 0 ZT16-19 0.5918285 0.5918285 0.5918285 ZT20-23 0.595515 0.595515 0.595515