Table 4. Fibrinogen (g/L) Reference Range and 90% Confidence Intervals.

	Age
	1, mo - 1, ya	2 - 5, ya	6 - 10, ya	11 - 17, ya	≥ 18, y
No.	52	49	47	37	126
Median	2.87	2.81	3.15	2.72	3.26
Lower limit	1.30	1.51	1.40	1.40	1.90
90% CI	1.04 - 1.59	1.28 - 1.78	1.04 - 1.79	1.10 - 1.73	1.51 - 2.18
Upper limit	4.37	4.25	4.84	4.10	5.13
90% CI	4.08 - 4.65	3.97 - 4.50	4.45 - 5.23	3.70 - 4.46	4.91 - 5.50
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		0.711	0.095	0.034	< 0.001
	1, mo - 5, y a		6 - 10, y a	11 - 17, y a	Adult
No.	182		47	37	126
Median	2.88		3.15	2.72	3.26
Lower limit (90% CI)	1.62 (1.17 - 1.83)		1.40 (1.04 - 1.79)	1.40 (1.10 - 1.73)	1.90 (1.51 - 2.18)
Upper limit (90% CI)	4.32 (4.09 - 4.43)		4.84 (4.45 - 5.23)	4.10 (3.70 - 4.46)	5.13 (4.91 - 5.50)
Between groups		1, mo - 5, y vs. 6 - 10, y		6 - 10, y vs. 11 - 17, y	11 - 17, y vs. ≥ 18, y
P value		0.042		0.034	< 0.001

^aRobust method.