condition mean min max ZT0-3 1.621935 0.47709 2.360715 ZT4-7 1.0637750000000001 1.0637750000000001 1.0637750000000001 ZT8-11 0.919608 0.919608 0.919608 ZT12-15 1.3475675 1.312055 1.38308 ZT16-19 1.79687 1.79687 1.79687 ZT20-23 2.3537049999999997 2.3537049999999997 2.3537049999999997