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Table 1 Distribution of cases by sex, household registration and age group in 2009–11 and in 2012–16

From: Epidemiological changes in measles infections in southern China between 2009 and 2016: a retrospective database analysis

  2009–11  2012–16  
 n (%)Proportion of Guangdong population aAveraged incidence
(Cases reported per 100,000)
n (%)Proportion of Guangdong population aAveraged incidence
(Cases reported per 100,000)
p-value b
Overall3194  19,168   
Sex
 Male1853 (58.0%)52.0%1.1811,264 (58.8%)52.5%4.010.43
 Female1341 (42.0%)48.0%0.907904 (41.2%)47.5%3.10
Household registration c
 Local1777 (55.6%)79.4%0.7213,000 (67.8%)76.1%3.17< 0.01
 Non-local951 (29.8%)20.6%1.476084 (31.7%)23.8%4.90
Age groups
 0–8 months548 (17.2%)0.8%22.715862 (30.6%)0.8%142.24< 0.01
 9–23 months769 (24.1%)1.5%16.404551 (23.7%)1.7%49.090.68
 2–6 years473 (14.8%)4.8%3.122646 (13.8%)5.2%9.610.13
 7–15 years315 (9.9%)14.1%0.63761 (4.0%)10.4%1.37< 0.01
 16–24 years558 (17.5%)18.0%1.031431 (7.5%)19.2%1.39< 0.01
 ≥ 25 years531 (16.6%)60.7%0.293917 (20.4%)62.7%1.16< 0.01
  1. a Averaged proportion of the total population in Guangdong over the period
  2. b Pearson’s chi-square test comparing number of cases by categories between 2009 and 11 and 2012–16
  3. c Numbers of local and non-local cases do not sum up as the total number of cases because some cases had missing household registration data; chi-squared test nevertheless showed statistically significant result for cases with complete data on household registration