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Table 1 General Characteristics of participants according to different age groups

From: Association of active Helicobacter pylori infection and anemia in elderly males

Characteristics Age group (years) P value Total (n = 646)
65~74 years (n = 239) 75~84 years (n = 162) ≥85 years (n = 245)
Mean ± SD
 Age (years) 69.48 ± 2.78 79.72 ± 2.97 88.87 ± 3.11 <  0.001 79.40 ± 8.90
 Hemoglobin(g/L) 145.91 ± 13.39 145.76 ± 13.09 146.14 ± 13.58 0.959 145.96 ± 13.36
 MCV(fl) 91.36 ± 4.47 90.57 ± 3.82 91.39 ± 3.70 0.084 91.18 ± 4.04
 Serum iron (μmol/L) 20.47 ± 6.49 19.97 ± 5.55 19.25 ± 5.57 0.076 19.88 ± 5.94
 CCI score 1.55 ± 1.27 1.95 ± 1.53 2.28 ± 1.68 <  0.001 1.93 ± 1.53
Median (IQR)
 Serum ferritin (ng/mL) 180.50 (110.80–256.50) 165.50 (109.80–272.75) 186.10 (107.30–273.60) 0.903 179.55 (110.08–268.10)
N (%)
 Malignant tumor 22 (9.2) 30 (18.5) 45 (18.4) 0.005 97 (15.0)
 Other comorbidities 13 (5.4) 25 (15.4) 65 (26.5) <  0.001 103 (15.9)
H. pylori positive 85 (35.6) 59 (36.4) 84 (34.3) 0.767 228 (35.3)