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. 2015 Apr 13;10(4):e0123166. doi: 10.1371/journal.pone.0123166

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© 2015 Xiao et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 3 — (A–F) Curves of smooth functions of each predictor variable in the 1971–1993 epoch, including R₁, R₃, MT₁, H₃, N₁, and N₁₂. (G-L) Curves of smooth functions of each predictor variable in the 1994–2012 epoch, including R₁, R₂, MT₁, MaxT₂, N₁, and N₁₂. The x-axis shows the value of each predictor variable, and the y-axis shows the value of each smooth function. The dashed line is the estimated 95% confidence interval. The vertical lines adjacent to the lower x-axis show the presence of data in the matching years. The numbers in the labels of y-axis denote the effective degrees of freedom. These plots demonstrate the complex non-linear relationship between HFRS cases and predictor variables.