condition mean min max ZT0-3 0.5831916666666667 0.4013455 0.674422 ZT4-7 0.380434 0.380434 0.380434 ZT8-11 0.7934845 0.7934845 0.7934845 ZT12-15 0.81936725 0.775537 0.8631975000000001 ZT16-19 0.7935810000000001 0.7935810000000001 0.7935810000000001 ZT20-23 0.704538 0.704538 0.704538