condition mean min max ZT0-3 3.56885587925 3.1582831195 3.9794286389999995 ZT4-7 2.677925026 2.0124502335 3.3433998185 ZT8-11 1.45477281425 0.941232755 1.9683128735 ZT12-15 4.18632210975 3.8839011845 4.488743035 ZT16-19 5.80853304975 5.6782267740000005 5.9388393255 ZT20-23 4.9973293555 3.8812669085 6.113391802500001