condition mean min max ZT0-3 1.0837595 0.862329 1.30519 ZT4-7 0.7453044999999999 0.7453044999999999 0.7453044999999999 ZT8-11 0.46452150000000003 0.46452150000000003 0.46452150000000003 ZT12-15 0 0 0 ZT16-19 1.059785 1.059785 1.059785 ZT20-23 1.063657 1.063657 1.063657