Table 5. D-dimer (µg/L) Reference Range and 90% Confidence Intervals.

	Age
	1, mo - 1, ya	2 - 5, ya	6 - 10, ya	11 - 17, ya	≥ 18, y
No.	44	39	45	35	122
Median	0.13	0.09	0.09	0.12	0.13
Upper limit	0.34	0.17	0.20	0.23	0.38
90% CI	0.28 - 0.39	0.15 - 0.19	0.17 - 0.23	0.20 - 0.26	0.35 - 0.40
Between groups		1 mo - 1, y vs. 2 - 5, y	2 - 5, y vs. 6 - 10, y	6 - 10, y vs. 11 - 17, y	11 - 17, y vs. ≥ 18, y
P value		< 0.001	0.272	0.103	0.150
	1, mo - 1, y a		2 - 17, y a		Adult
No.	44		115		122
Median	0.13		0.09		0.13
Upper limit (90% CI)	0.34 (0.28 - 0.39)		0.18 (0.17 - 0.26)		0.38 (0.35 - 0.40)
Between groups	1, mo - 1, y vs. 2 - 17, y				2 - 17, y vs. adult
P value	< 0.001				< 0.001

^aRobust method.