condition mean min max ZT0-3 67.95597913 61.03360374 74.87835452 ZT4-7 26.27037715475 17.9981890795 34.54256523 ZT8-11 17.07493686575 11.456618946 22.6932547855 ZT12-15 55.5681901025 51.50987718499999 59.62650302 ZT16-19 57.7393758425 54.326437330000005 61.152314355 ZT20-23 57.280718934999996 55.79036649 58.771071379999995