highly significantp < 0.01
Highly significant ( p < 0.01) and positive correlations were shown between 19Z9A/XDX-BIL and 20Z9A/XDX-BIL, between 19Z9A/XDX-BIL and two-year average fertility, and between 20Z9A/XDX-BIL and two-year average fertility, with the correlation coefficients of 0.750, 0.934, and 0.943, respectively.