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Table 1 Socio-demographic features of the total 244 patients and univariate analysis by subgroups

From: Prevalence of submicroscopic malaria infection in immigrants living in Spain

Frequency, n (%) Total N  =  244 Patients with submicroscopic malaria N = 14 Negative patients N = 230 P value*
Age [years], median (IQRa) 41 (33–48) 41 (32–45) 41 (23–48) 0.742
Gender, male, n (%) 132 (54.1%) 8 (57.1%) 124 (53.9%) 1.000
Sub-Saharan origin, n (%) 224 (91.8%) 14 (100%) 210 (91.3%) 1.000
Time of residence in Spain [years], median (IQR) 11.1 (5.7–16.2) 8.9 (4.3–12.9) 11.3 (6.0–16.3) 0.163
Travels to endemic area since first arrival in Spain (yes/no), n (%) 86 (35.3) 7 (50.0) 79 (34.4) 0.257
Anti-malarial chemoprophylaxisa, n (%) 14/86 (16.3) 1/7 (14.3) 13/79 (16.5) 1.000
Time from last travel to endemic areab [months], median (IQR) 6.2 (3.5–9.4) 4.0 (3.4–6.0) 6.6 (3.5–9.5) 0.170
Previous malaria, n (%) 104 (42.6) 6 (42.9) 98 (42.6) 0.160
  1. *P values < 0.05 were considered statistically significant. Mann Whitney U-test and Fischer’s exact tests were performed for quantitative and categorical variables respectively
  2. aPatients who had returned to endemic area after first arrival in Spain were defined as the total population (denominator)
  3. bEvaluated in patients without chemoprophylaxis intake before last time to endemic area