Table 4.

Derivation of dengue cases in Malaysia using expansion factors (2009), by sector and setting*

Sector	Hospitalized cases	Ambulatory cases	Overall
Adjusted EFs (combining mean factors, 58% share ambulatory)
Public	1.30	43.08†	2.97
Private	2.45	178.84†	5.73
Both‡	1.65	65.38†	3.79
No. reported dengue cases
Public	27,955	1,165	29,120
Private	12,105	229	12,334
Total	40,060	1,394	41,454
Adjusted dengue cases using EFs (58% share ambulatory)
Public	36,341	50,186	86,527
Private	29,658	40,955	70,613
Total	65,999	91,141	157,140
Row %	42.00	58.00	100.00

^*EF = expansion factor.

^†EFs were estimated by comparing the EF adjusted cases and reported cases, assuming that the total ratio of public/private ambulatory cases is the same as this ratio for hospitalized cases. The EFs for ambulatory cases were indirectly derived in two steps. First, we obtained EFs for hospitalized cases in the private and public sectors (second column) and the share of the total cases that were ambulatory (58%) from the Delphi process. Second, we derived EFs for ambulatory cases by dividing the estimate of total ambulatory cases for each sector by the officially reported cases.

^‡The both row and overall column are derived by comparing the projected and reported numbers.