Table 1.

Demographic and clinical data on dengue inpatients, Tan Tock Seng Hospital, Singapore, 2006–8^*

Characteristic	Proportion (N = 2115)
Female	33% (51%)
Aged < 20	6% (24%)
Aged 20–39	59% (30%)
Aged 40–59	30% (31%)
Aged 60+	6% (14%)
Chinese ethnicity	69% (74%)
Indian ethnicity	12% (9%)
Malay ethnicity	5% (13%)
Other ethnicity	14% (3%)
Singapore citizens	47% (64%)†
Satisfying criteria for
Dengue fever 1997	91%
DHF 1997	22%
DSS 1997	1%
Severe dengue 2009	12%

^*Eleven other patients who did not have data on onset of fever were excluded from analysis. Except where otherwise noted, in parenthesis, demographic data for the resident population (i.e., Singapore citizens and permanent residents) are presented for comparison; these are derived from the 2010 census of population published by the Singapore Department of Statistics. Detailed data on non-residents, that is, foreigners' resident in Singapore, but without permanent residence status, are not published by the Department of Statistics.

^†Proportion of citizens to the entire population, which consists of citizens, permanent residents, and non-residents.