. 2023 Jun 15;33(2):020706. doi: 10.11613/BM.2023.020706

Table 2. Study’s reference interval defined as percentiles.

	Age, years				Percentile
Analyte (unit)	total	stratified	N	2.5^th	5^th	50^th	95^th	97.5^th
	20-45*		3455	2.77	3.22	6.31	10.74	11.50
DHEAS (µmol/L)		20-25^†	842	3.65	4.16	7.4	11.79	12.76
		25-35*	1627	2.97	3.32	6.37	10.64	11.50
		35-45^†	990	2.30	2.71	5.41	9.03	9.83
	20-45^†		518	2.48	2.83	5.13	8.20	8.89
Androstenedione (nmol/L)		20-30^†	267	3.02	3.38	5.76	8.75	9.43
		30-45^†	250	2.23	2.54	4.51	7.16	7.75
DHEAS and androstenedione are calculated as total reference interval (RI) and with stratified age groups. RIs are defined with 5^th and 95^th percentile (90%RIs) and with 2.5^th and 97.5^th percentile (95%RIs). Median is 50^th percentile. *Non-parametric percentile method. ^†Parametric method after Box-Cox transformation. DHEAS – dehydroepiandrostenedione sulphate.