Figure 3
From: Comparison of publication trends in dermatology among Japan, South Korea and Mainland China
The influence of GDPPC on publications over last 10 years. Figure 3a exhibits the GDPPC in each year from 2003 to 2012. Linear regression was used to analyze the significance. Figure 3b and c display the correlation of number of publications and impact factor per paper with GDPPC, respectively. Two-tailed Pearson test was used to determine significance. Figure 3d exhibits the changes in the number of publications per GDPPC over the last 10 years. Linear regression was used to analyze the significance. Part of data (2003–2011) for mainland China in 4a and b was reported earlier [6].