TABLE 1.

CD4+ cell counts for healthy HIV-negative adults in Botswana.

Source	Sex	N	CD4+ cell counts (cells/mm3)
			Mean	s.d.	95% CI	Median	Range	2.5th–97.5th percentile
General population	Combined	261	859	284	824–894	827	261–1667	374–1527
	Female	135	949	288	900–998	924*	268–1667	467–1603
	Male	126	762	247	719–805	744*	261–1538	333–1275
Blood donors	Combined	437	759	245	736–782	726	171–1652	366–1318
	Female	143	827	245	787–868	786	344–1558	438–1328
	Male	294	725	238	698–753	698	171–1652	366–1252

Source: Blood donor data quoted from Bussmann H, Wester CW, Masupu KV, et al. Low CD4+ T-lymphocyte values in HIV-negative adults in Botswana. Clin Diagn Lab Immunol. 2004;11:930–935. PMid:15358655, PMCid:515279

N, Number of subjects; CI, confidence interval; s.d., standard deviation.

^*p < 0.001 (Mann-Whitney U test used to calculate p-values).