Table 2 Epidemiological characteristics of measles in Shandong Province, 2009–2017
| Â | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | Total |
|---|---|---|---|---|---|---|---|---|---|---|
Cases | 2185 | 1759 | 484 | 21 | 1476 | 2245 | 2969 | 4404 | 104 | 15,647 |
Gender ratio (M/F) | 1.53 | 1.56 | 1.56 | 2.50 | 1.47 | 1.2 | 1.24 | 1.19 | 1.67 | 1.32 |
Age (years) (%) | ||||||||||
  < 5 | 48.6 | 57.0 | 53.3 | 66.7 | 61.9 | 45.4 | 50.9 | 40.4 | 60.6 | 48.7 |
 5–19 | 12.5 | 7.2 | 6.2 | 4.8 | 4.0 | 5.7 | 4.9 | 7.3 | 8.7 | 7.0 |
 20–39 | 34.1 | 29.6 | 31.6 | 19.0 | 25.7 | 35.3 | 28.4 | 34.6 | 17.3 | 31.8 |
  ≥ 40 | 4.8 | 6.2 | 8.9 | 9.5 | 8.4 | 13.6 | 15.8 | 17.7 | 13.4 | 12.5 |
Occupation (%) | ||||||||||
 Scattered children | 46.2 | 57.2 | 52.9 | 61.9 | 60.8 | 44.6 | 50.5 | 39.9 | 55.8 | 47.9 |
 Students | 13.1 | 6.4 | 7.4 | 14.3 | 4.9 | 6.3 | 5.1 | 7.5 | 14.4 | 7.3 |
 Farmers | 20.5 | 20.5 | 18.6 | 9.5 | 19.4 | 27.1 | 22.5 | 31.6 | 12.5 | 24.7 |
 Workers | 6.4 | 5.5 | 8.5 | 4.8 | 3.9 | 6.0 | 6.3 | 5.1 | 1.9 | 5.7 |
 Housekeeping | 2.8 | 3.1 | 3.9 | 0.0 | 4.4 | 5.9 | 5.9 | 5.9 | 4.8 | 4.9 |
 Others | 11.0 | 7.3 | 8.7 | 9.5 | 6.6 | 10.1 | 9.7 | 10.0 | 10.6 | 9.5 |