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Table 1 Demographic characteristics of malaria cases in China, 2010–2014

From: Trends of imported malaria in China 2010–2014: analysis of surveillance data

Variable Categories 2010 2011 2012 2013 2014
No. % No. % No. % No. % No. %
Sex (N = 17,725) Male 3704 77.72 2873 85.66 2363 92.02 3847 95.51 2856 94.92
Female 1062 22.28 481 14.34 205 7.98 181 4.49 153 5.08
Age (N = 17,725) <10 237 4.97 117 3.40 36 1.40 22 0.55 16 0.53
10–19 365 7.66 147 4.38 106 4.13 92 2.28 47 1.56
20–29 1014 21.28 799 23.82 593 23.09 928 23.04 656 21.80
30–39 1121 23.52 870 25.94 738 28.74 1159 28.77 802 26.65
40–49 1052 22.07 967 28.83 797 31.04 1415 35.13 1071 35.59
50–59 464 9.74 248 7.39 243 9.46 378 9.38 372 12.36
≥60 513 10.76 206 6.14 55 2.14 34 0.84 45 1.50
Occupation (N = 17,725) Farmer 2323 48.74 1643 48.99 1098 42.76 2207 54.79 1260 41.87
Labourer 1107 23.22 569 16.96 392 15.26 588 14.60 405 13.46
Worker 326 6.84 292 8.71 325 12.66 419 10.40 433 14.39
Officer 86 1.80 100 2.98 110 4.28 138 3.43 113 3.76
Other 924 19.39 750 22.36 643 25.03 676 16.78 798 26.52
Purpose of travelling overseas (n = 3220) Labour export 29 74.36 347 91.80 446 91.21 1525 96.15 680 93.41
Business trip 1 2.56 9 2.38 7 1.43 18 1.13 11 1.51
Tourism 1 2.56 4 1.06 5 1.02 10 0.63 7 0.96
Study 4 10.26 2 0.53 9 1.84 8 0.50 0 0
Other 4 10.26 16 4.23 22 4.50 25 1.58 30 4.12
Days staying overseas (n = 2124) Days           
≤30 6 6.59 17 11.72 18 7.17 30 2.36 27 7.34
31–180 28 30.77 44 30.34 76 30.28 207 16.31 113 30.71
181–365 25 27.47 40 27.59 69 27.49 516 40.66 104 28.26
≥366 32 35.16 44 30.34 88 35.06 516 40.66 124 33.70