Table 3. Impact of ethnicity and red blood cell variants on P. falciparum density.

	cyfu	No. events	Median parasites/μL (IQR)	p-value*	p-value**
Total	2655.7	4091	14700(3850, 30100)	NA	NA
Ethnicity
Malinke	2306.4	3474	14900(3900, 30600)	REF	REF
Fulani	206.2	344	13275(3000, 27650)	0.2164	0.0769
Bambara	92.0	201	14700(5300, 29950)	0.1426	0.1395
Sarakole	44.6	45	16025(3375, 24950)	0.3091	0.2429
Dogon	6.4	27	8550(1900, 18700)	0.1911	0.1943
Sex
Girls	1303.5	2057	14100(3900, 29475)	REF	NA
Boys	1352.2	2034	15000(3800, 31000)	0.9419	NA
β-globin variant
HbAA	2092.2	3343	15150(4250, 31050)	REF	REF
HbAS	378.0	408	10550(1350, 26250)	0.0004	0.0004
HbAC	167.8	321	13950(5100, 27050)	0.6759	0.7757
HbSC	14.0	12	750(75, 1700)	0.1126	0.1029
HbCC	2.2	4	5100(425, 6300)	0.3165	0.3154
HbSS	1.5	3	22125(100, 22125)	0.3154	0.3150
α-globin variant
Normal (αα/αα)	1904.1	2876	14250(3800, 29900)	REF	REF
α+ trait (-α3.7/αα)	699.9	1127	15675(4050, 30550)	0.7769	0.7273
α0 trait (-α3.7/-α3.7)	51.7	88	12775(3950, 26850)	0.6932	0.6874
ABO blood group
A	804.2	1266	14400(3900, 28125)	REF	REF
B	574.8	936	14250(3100, 32325)	0.8027	0.7580
AB	198.1	327	15750(4650, 32450)	0.1503	0.1843
O	1078.6	1562	14915(4175, 29975)	0.5881	0.9525
G6PD A- genotype
Boys
Normal	1226.0	1837	15000(3725, 30600)	REF	REF
A- hemizygotes	126.2	197	15100(4350, 33075)	0.5188	0.4440
Girls
Normal	1044.3	1621	14025(3900, 28950)	REF	REF
A- heterozygotes	235.6	419	14750(3900, 30600)	0.6897	0.8397
A- homozygotes	23.6	17	10950(450, 36650)	0.1091	0.1843

REF, reference group.

^*Adjusted for age only (bivariate analyses)

^**Adjusted from multivariate analyses that included age, ethnicity, β-globin and α-globin variants, ABO blood group, and G6PD A- genotype