condition mean min max ZT0-3 1.9294883333333335 1.711975 2.283605 ZT4-7 1.495895 1.495895 1.495895 ZT8-11 0.801794 0.801794 0.801794 ZT12-15 0.7990865 0.720966 0.8772070000000001 ZT16-19 1.0992285000000002 1.0992285000000002 1.0992285000000002 ZT20-23 1.4209200000000002 1.4209200000000002 1.4209200000000002