Characteristic | n | Characteristic | n |
Province Shanghai Beijing Hubei Sichuan Heilongjiang Gender Male Female Ages 30 - 39 years 40 - 49 years ≥50 years |
4 2 8 3 1
1 17
5 9 4 | Education level Master degree Doctor degree Title Middle professional title High professional title Work place In hospitals In universities |
14 4
4 14
2 16 |