condition mean min max ZT0-3 1.4594500000000001 1.4594500000000001 1.4594500000000001 ZT4-7 1.1991785 1.1991785 1.1991785 ZT8-11 1.0351495 1.0351495 1.0351495 ZT12-15 1.5399150000000001 1.5399150000000001 1.5399150000000001 ZT16-19 1.98845 1.98845 1.98845 ZT20-23 1.8788 1.8788 1.8788