condition mean min max ZT0-3 5.065372333333333 0.7952520000000001 7.60901 ZT4-7 1.326368 1.326368 1.326368 ZT8-11 3.8377749999999997 3.8377749999999997 3.8377749999999997 ZT12-15 7.89085 6.772880000000001 9.00882 ZT16-19 5.4916 5.4916 5.4916 ZT20-23 7.190635 7.190635 7.190635