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Table 1 Demographic data of subjects

From: Post-infection cognitive impairments in a cohort of elderly patients with COVID-19

  Patients (n = 1539) Severe cases (n = 238) Non-severe cases (n = 1301) Control (n = 466) P value Patients vs. Control P value Severe vs. Non-Severe
Age – Median (IQR), year 69 (66, 75) 72(67–80) 68(66–74) 67(66–76) 0.119a < 0.001a
Male – No. (%) 738 (47.95) 128(53.8) 607(46.7) 226(48.5) 0.761b 0.041b
Education – Median (IQR), year 12 (9–12) 12(6–12) 12(9–12) 12(6–12) 0.758a 0.003 a
BMI – Median (IQR), kg/m2 24.0(22.5–25.4) 24.4(22.9–25.7) 23.9(22.4–25.3) 24.2(22.5–25.6) 0.407a 0.002a
Coexisting disorders – No. (%)
 Hypertension 589 (38.27) 112(47.1) 477(36.7) 164(35.2) 0.229b 0.002b
 Diabetes mellitus 304 (19.75) 52(21.8) 252(19.4) 87(18.7) 0.605b 0.377b
 Hyperlipidemia 155 (10.07) 27(11.3) 128(9.8) 42(9.0) 0.501b 0.478b
 Stroke history 87 (5.65) 40(16.8) 47(3.6) 36(7.7) 0.102b < 0.001b
 Coronary heart disease history 212 (13.78) 66(27.7) 146(11.2) 67(14.4) 0.704b < 0.001b
 COPD 150 (9.75) 42(17.6) 108(8.3) 42(9.0) 0.637b < 0.001b
ICU admission – No. (%) 81 (5.26) 56(23.5) 24(1.8)    < 0.001b
Mechanical Ventilation, No. (%) 96 (6.24) 62(26.1) 33(2.5)    < 0.001b
High flow oxygen therapy, No. (%) 326 (21.18) 93(39.1) 232(17.8)    < 0.001b
Delirium, No. (%) 105 (6.82) 61(25.6) 43(3.3)    < 0.001b
  1. Abbreviation: IQR Inter-Quartile Range, BMI Body Mass Index, ICU Intensive Care Unit, COPD Chronic Obstructive Pulmonary Disease
  2. aMann-Whitney U test
  3. bPearson χ2 test