Table 4. Evaluation of risk factors associated with acute parvovirus B19 infection among the SCA patients.

Parameter	N	IgM(%)	RR (95% CI)	χ2	P
Sex
Male	40	15	1
Female	33	21.2	1.41	0.47	0.5
Age group (year)
≤12	18	44.4	10.22 (1.4 -74.4)	7.3	0.007
13-18	27	14.8	3.41 (0.4 - 28.4)	1.5	0.2
19-25	23	4.3	1
26+	5	0	-
Sickle cell status
Steady	48	14.6	1
Unsteady
Hospitalization in the preceding 12 months, n (%)
0	10	0	-
1	51	11.8	1
2	8	50	4.25 (1.5-11.3)		0.02
3+	4	75	6.38 (2.5-16.3)		0.01
Outpatient visit in the preceding 12 months, n(%)
0	0	0	-
1	18	16.7	1
2	22	27.3	1.64		0.5
3+	33	12.1	0.73		0.7
Body mass Index, kg/m2, n (%)
< 20	31	16.1	1
20-24	42	19.0	1.18 (0.4-3.3)	0.1	0.3
25+	0	0
Children/Household, n (%)
1	3	0	-
2	19	10.5	1
3	37	10.8	1.03 (0.2-5.1)		1.0
4+	14	50	4.75 (1.2-19.5)		0.02

SCA: sickle cell anemia; RR: relative risk; CI: confidence interval.