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Table 1 Baseline characteristics of included and excluded subjects

From: Haemoglobin, magnetic resonance imaging markers and cognition: a subsample of population-based study

  Included (n = 796) Excluded (n = 756)a p Value
Age, years, mean (SD) 70.0 (6.6) 71.9 (6.9) < 0.001
Female sex, n (%) 432 (54.3) 433 (57.3) 0.015
Education (≤ 6 years), n (%) 489 (61.4) 554 (73.3) < 0.001
Ethnicity < 0.001
 Chinese, n (%) 273 (34.2) 333 (44.0)
 Malay, n (%) 263 (33.0) 194 (25.7)
 Indian, n (%) 260 (32.7) 229 (30.3)
Diabetes mellitus, n (%) 289 (36.3) 260 (34.4) 0.430
Hypertension, n (%) 621 (78.0) 634 (83.9) 0.003
Hyperlipidaemia, n (%) 586 (73.6) 498 (65.9) 0.001
Smoking, n (%) 198 (24.9) 185 (24.4) 0.854
BMI, kg/m2, mean (SD) 23.4 (4.6) 23.6 (4.6) 0.982
Mean arterial blood pressure, mmHg, mean (SD) 97.4 (10.4) 97.8 (11.3) 0.282
Total cholesterol, mmol/L, mean (SD) 5.1 (1.2) 5.2 (1.2) 0.354
Random blood glucose, mmol/L, mean (SD) 7.1 (3.1) 7.1 (3.1) 0.846
Haemoglobin, g/dl, mean (SD) 13.4 (1.4)
Creatinine, μmol/L, median (IQR) 72 (30)
eGFR, ml/min, mean (SD) 91 (29)
  1. BMI Body mass index, eGFR Estimated glomerular filtration rate
  2. aExcluded subjects were screened positive non-responders, had ungradable magnetic resonance imaging scans or absent haemoglobin levels