condition mean min max ZT0-3 4.274445086 2.2107936880000003 6.338096483999999 ZT4-7 22.404457219999998 15.838129200000001 28.970785239999998 ZT8-11 34.819675509999996 33.464512635 36.174838385 ZT12-15 40.857896662499996 35.942175465 45.77361786 ZT16-19 23.766356285 22.26033776 25.272374810000002 ZT20-23 18.359065192499997 17.627572865 19.090557519999997