Table 2 Demographic data of subjects included and not included in this study

Age – Median (IQR), year

69 (66, 75)

70 (66, 75)

0.165^a

Male – No. (%)

738 (47.95)

826 (48.76)

0.647^b

Education – Median (IQR), year

12 (9–12)

12 (9–12)

0.226^a

BMI – Median (IQR)

23.97 (22.52, 25.38)

23.92 (22.42, 25.41)

0.284^a

Severe cases -No. (%)

238 (15.46)

257 (15.17)

0.845^b

Coexisting disorders – No. (%)

 Hypertension

589 (38.27)

640 (37.78)

0.800^b

 Diabetes mellitus

304 (19.75)

348 (20.54)

0.599^b

 Hyperlipidaemia

155 (10.07)

176 (10.39)

0.772^b

 Stroke history

87 (5.65)

91 (5.37)

0.758^b

 Coronary heart disease history

212 (13.78)

231 (13.64)

0.919^b

 COPD

150 (9.75)

163 (9.62)

0.905^b

ICU admission – No. (%)

81 (5.26)

94 (5.55)

0.756^b

Mechanical Ventilation, No. (%)

96 (6.24)

106 (6.26)

1.000^b

High flow oxygen therapy, No. (%)

326 (21.18)

355 (20.96)

0.897^b

Delirium, No. (%)

105 (6.82)

117 (6.91)

0.945^b