. 2020 Jul 16;11:1411. doi: 10.3389/fimmu.2020.01411

Table 3.

Reference intervals of TREC and KREC in different age groups.

Age group (years)	n	TREC (copies/μL)		TREC (copies/10⁶ cells)		KREC (copies/μL)		KREC (copies/10⁶ cells)
		Median ± SD	5^th–95^th percentile	Median ± SD	5^th–95^th percentile	Median ± SD	5^th–95^th percentile	Median ± SD	5^th–95^th percentile
<1	9	313 ± 363	223–1,355	304,896 ± 136,873	151,107–526,408	249 ± 219	134–713	217,210 ± 74,795	115,946–345,920
1–4	57	249 ± 170	74–656	213,155 ± 134,031	66,845–461,833	140 ± 116	31–470	114,289 ± 69,069	35,491–275,571
5–8	67	144 ± 83	53–284	151,838 ± 84,272	58,281–357,873	65 ± 47	21–171	69,186 ± 35,861	29,471–150,023
9–12	59	101 ± 73	30–279	125,197 ± 68,390	38,206–285,532	51 ± 46	16–186	64,424 ± 40,532	25,425–182,274
13–18	102	64 ± 50	21–209	86,770 ± 58,610	27,173–229,987	30 ± 28	8–107	36,610 ± 33,621	11,684–116,963
19–30	38	29 ± 22	12–99	38,543 ± 20,899	20,831–104,674	19 ± 20	1–70	21,262 ± 15,840	3,063–66,698
31–40	43	22 ± 23	10–96	29,356 ± 15,133	8,436–61,274	14 ± 28	2–77	18,056 ± 14,683	6,098–59,155
41–50	31	17 ± 13	7–57	20,996 ± 10,369	6,644–40,467	16 ± 29	4–114	22,835 ± 23,488	7,363–103,165
51–60	31	11 ± 10	0–37	12,706 ± 14,525	0–52,945	13 ± 13	3–45	17,933 ± 15,506	5,566–58,917
>61	43	11 ± 12	0–39	11,668 ± 11,130	0–35,331	22 ± 26	1–99	21,092 ± 18,671	2,907–53,655