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Table 1 Characteristics of cases and controls

From: Epidemiological risk factors for adult dengue in Singapore: an 8-year nested test negative case control study

Variable Category Case Control
   n % n %
Total   395   1308  
Age group <21 13 3.3 140 10.7
21 to 30 130 32.9 396 30.3
31 to 40 97 24.6 238 18.2
41 to 50 76 19.2 235 18.0
51 to 60 55 13.9 197 15.1
61 and above 24 6.1 102 7.8
Gender (Female/Male) Female 142 35.9 503 38.5
Ethnicity Chinese 265 67.1 781 59.7
Malay 33 8.4 240 18.3
Indian 57 14.4 193 14.8
Other 40 10.1 94 7.2
Home address region SW 52 13.4 204 15.8
C 204 52.4 646 50.0
NW 62 15.9 264 20.4
NE 61 15.7 158 12.2
SE 10 2.6 20 1.5
Country of origin (Singapore/Others) Singapore 248 62.8 909 69.5
Healthcare recruitment site A 217 54.9 807 61.7
B 12 3.0 24 1.8
C 34 8.6 180 13.8
D 28 7.1 63 4.8
E 33 8.4 193 14.8
F 71 18.0 41 3.1
Medical history (Diabetes/Hypertension/IHD/Malignancy/Steroid treatment) [No/Yes] No 338 85.6 1099 84.1
Self-reported history of past dengue infection (No/Yes) No 378 96.7 1235 95.0
Dwelling type Multistorey public flats 291 73.7 1082 82.8
Multistorey private flats 18 4.6 64 4.9
Landed houses 35 8.9 83 6.4
Foreign (construction) workers dormitory/hostel 51 12.9 77 5.9
Dwelling floor level mean floor 6 4a 7 4a
Travel history (No/Yes) No 342 86.6 1101 84.3
Type of employment (Indoor/Outdoor/Both) and Primary mode of transportation to work (Public-train or bus/Private-taxi or car/Walking) Unemployed 90 22.8 269 20.7
Indoor & Public 90 22.8 410 31.6
Indoor & Private 24 6.1 84 6.5
Indoor & Walking 10 2.5 41 3.2
Outdoor & Public 37 9.4 108 8.3
Outdoor & Private 24 6.1 51 3.9
Outdoor & Walking 19 4.8 29 2.2
Both & Public 52 13.2 208 16.0
Both & Private 35 8.9 80 6.2
Both & Walking 14 3.5 19 1.5
Self-reported history of mosquito bite (No/Yes) No 291 73.7 994 76.5
Self-reported history of household dengue (No/Yes) No 372 94.4 1294 99.2
Self-reported history of household fever (No/Yes) No 295 74.7 1076 82.6
  1. aStandard Deviation