condition mean min max ZT0-3 1.1823363333333334 1.008479 1.3918650000000001 ZT4-7 0.7068574999999999 0.7068574999999999 0.7068574999999999 ZT8-11 1.203395 1.203395 1.203395 ZT12-15 1.86051 1.842985 1.8780350000000001 ZT16-19 1.88916 1.88916 1.88916 ZT20-23 1.6701480000000002 1.6701480000000002 1.6701480000000002