condition mean min max ZT0-3 1.018805 1.0092750000000001 1.028335 ZT4-7 1.02992 1.02992 1.02992 ZT8-11 1.016475 1.016475 1.016475 ZT12-15 0 0 0 ZT16-19 2.527625 2.527625 2.527625 ZT20-23 1.77932 1.77932 1.77932