condition mean min max ZT0-3 44.25681272 43.292845449999994 45.22077999 ZT4-7 15.559604385 12.774791835 18.344416935 ZT8-11 23.1690021 15.845975785 30.492028415 ZT12-15 34.0847772725 31.35170637 36.817848174999995 ZT16-19 40.02977068 39.054670665 41.004870695 ZT20-23 40.4395719325 39.794930455 41.084213410000004