Table 1. Study characteristics by ethnic group.

					Dogon (n=505, 53.8%)					Fulani (n= 434, 46.2%)					P-value
					N (median)		% (range)			N (median)			%(Range)
Age (in months)					(204)		(24-744)			(168)			(24-900)		0.05
	0-4 years old				64		12.6			65			15.0		0.10
	5-9 years old				85		16.8			78			18.0
	10-15 years old				86		17.0			93			21.4
	>15 years old				270		53.5			198			45.6
Male					219		43.4			192			44.2		0.84
Rainy season					332		65.7			262			60.4		0.10
AB0 blood group
		0			195		43.5			237			56.5		<10-4
		A			90		20.1			87			20.8
		B			136		30.4			78			18.6
		AB			27		6.0			17			4.1
Malaria
		Clinical malaria			63		12.5			30			6.9
		Asymptomatic			91		18.0			79			18.2
		None			351		69.5			325			74.9		0.02
Immunological data
		AMA1			(1078)		(0 - 72,770)			(1742)			(2-72,770)		10-3
		MSP1			(467)		(0 - 131,800)			(2063)			(19-356,900)		<10-6
		MSP2			(1427)		(0 - 777,500)			(3164)			(49-777,500)		<10-6
		CSP			(679)		(75-779,700)			(1338)			(0 - 1,387,000)		<10-6
		Total IgE			(1403)		(0 - 21,780)			(1662)			(171-28,960)		0.02
Parasitological data
		Parasite positivity			108		21.6			71			16.5		0.06
		Pf density			(0)		(0 - 3,034,000)			(0)			(0 - 684,400)		0.02
		Hyperparasitaemia			56		11.1			25			5.8		<10-2
		Spleen enlargement			44		8.7			133			30.6		<10-6
Beta-globin HBB SNPs
HbS
			AA genotype		446		(96.3)			420			(97.9)
			AS genotype		17		(3.7)			9			(2.1)		0.231
HbC
			GG genotype		341		(92.4)			333			(99.1)
			AG/AA genotypes		28		(7.6)			3			(0.9)		<10-4

Hyperparasitaemia: parasitemia density greater than 10,000 parasites per microlitre; Parasite positivity: presence of one or more parasite per microlitre; Pf density: number of parasite per microlitre; Spleen enlargement: presence of spleen enlargement; the P-values were calculated from a chi-squared test for qualitative variables and a Mann-Whitney test for continuous variables.