Table 2. PT (s) Reference Range and 90% Confidence Intervals.

	Age
	1, mo - 1, ya	2 - 5, ya	6 - 10, ya	11 - 17, ya	≥ 18, y
No.	51	49	45	38	121
Median	13.8	14.2	14.5	14.7	14.0
Lower limit	12.3	12.3	13.1	12.8	12.8
90% CI	12.0 - 12.6	12.0 - 12.7	12.8 - 13.4	12.4 - 13.2	12.7 - 13.0
Upper limit	15.5	16.1	16.0	16.6	15.4
90% CI	15.2 - 15.8	15.7 - 16.5	15.5 - 16.3	16.1 - 17.1	15.1 - 15.9
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		0.073	0.076	0.439	< 0.001
	Children				Adults
No.	183				121
Median	14.3				14.0
Lower limit (90% CI)	12.7 (12.5 - 12.9)				12.8 (12.7 - 13.0)
Upper limit (90% CI)	16.2 (16.2 - 16.7)				15.4 (15.1 - 15.9)
P value	< 0.001

^aRobust method.