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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 a

Averaged incidence

(Cases reported per 100,000)

n (%)

Proportion of Guangdong population a

Averaged incidence

(Cases reported per 100,000)

p-value b

Overall

3194

  

19,168

   

Sex

 Male

1853 (58.0%)

52.0%

1.18

11,264 (58.8%)

52.5%

4.01

0.43

 Female

1341 (42.0%)

48.0%

0.90

7904 (41.2%)

47.5%

3.10

Household registration c

 Local

1777 (55.6%)

79.4%

0.72

13,000 (67.8%)

76.1%

3.17

< 0.01

 Non-local

951 (29.8%)

20.6%

1.47

6084 (31.7%)

23.8%

4.90

Age groups

 0–8 months

548 (17.2%)

0.8%

22.71

5862 (30.6%)

0.8%

142.24

< 0.01

 9–23 months

769 (24.1%)

1.5%

16.40

4551 (23.7%)

1.7%

49.09

0.68

 2–6 years

473 (14.8%)

4.8%

3.12

2646 (13.8%)

5.2%

9.61

0.13

 7–15 years

315 (9.9%)

14.1%

0.63

761 (4.0%)

10.4%

1.37

< 0.01

 16–24 years

558 (17.5%)

18.0%

1.03

1431 (7.5%)

19.2%

1.39

< 0.01

 ≥ 25 years

531 (16.6%)

60.7%

0.29

3917 (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