Table 2.

Age distribution of DV IgM-positive patients in relation to place of residence

Age group (yr)	Value for patients residing:
	On Caribbean islands (n = 1,016)		In the United States (n = 709)
	No. of samples	% of total	No. of samples	% of totala
<10	103	10.1	34	4.8*
11–20	275	27.1	97	13.7*
21–40	236	23.3	211	29.8*
41–60	226	22.2	257	36.2*
>60	169	16.6	104	14.7
Unknown	7	0.7	6	0.8

^a*, significantly different (P < 0.01) from the comparable value observed for the Caribbean islands group.