TABLE 1.

Reference values of lymphocyte subpopulations and CD4⁺/CD8⁺ T-cell ratios obtained from healthy adults in Nouna, Burkina Faso^a

Percentile	CD3+ CD4+ T cellsb		CD3+ CD8+ T cells		CD4+/CD8+ T-cell ratio	CD3+ T cells		CD19+ B cells		CD16+ CD56+ NK cellsb
	%	μl−1	%	μl−1		%	μl−1	%	μl−1	%	μl−1
Total group (n = 186)
95th	53	1,718	35	1,167	2.8	80	2,921	22	658	28	1,047
75th	45	1,305	29	814	2.2	75	2,364	16	457	19	485
50th (median)	41	1,082	24	600	1.7	70	1,801	13	336	14	352
25th	37	849	20	496	1.3	66	1,503	11	251	10	247
5th	30	631	16	328	0.9	57	1,069	7	148	7	150
Males (n = 97)
95th	48	1,696	37	1,164	2.5	79	2,963	21	633	30	1,294
75th	43	1,231	29	814	2.0	72	2,146	16	428	21	585
50th (median)	39	979	24	595	1.6	68	1,690	13	351	17	408
25th	35	790	21	498	1.2	63	1,417	10	245	13	287
5th	26	546	17	324	0.9	56	1,036	7	141	8	185
Females (n = 89)
95th	53	1,749	35	1,202	3.1	81	2,921	23	716	21	681
75th	48	1,328	29	818	2.2	76	2,275	17	483	16	437
50th (median)	44	1,169	25	620	1.7	73	1,890	13	329	12	313
25th	40	973	20	496	1.4	69	1,589	11	272	8	212
5th	32	716	15	328	1.1	60	1,176	7	181	6	141

^aRelative (%) and absolute (cells μl⁻¹) counts are given.

^bStatistically significant difference between males and females (Student's t test, P < 0.01).