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Table 4 Exploratory factor analysis of TCM inquiry

From: Validation of a new simple scale to measure symptoms in heart failure from traditional Chinese medicine view: a cross-sectional questionnaire study

Factor

Number

Item

Factor loading

Extraction sums of squared loadings

% of varaince

Cumulative %

Cronbach’s α

Qi Depression (Factor 1)

Q18

Anxiety and preoccupation

0.867

8.297

41.487

41.487

0.929

Q19

Depression

0.833

Q20

Disinclination to talk

0.789

Q17

Vexation and agitation

0.740

Q3

Night panting

0.518

Heart Qi Vacuity and Blood Stasis (Factor 2)

Q4

Panting on exertion

0.775

1.825

9.124

50.611

0.793

Q8

Oppression in the chest

0.725

Q9

Chest pain

0.708

Q5

Shortness of breath

0.690

Q6

Shortage of qi

0.644

Q7

Palpitations

0.635

Heart Blood Vacuity (Factor 3)

Q12

Listlessness of essence-spirit

0.672

1.452

7.258

57.869

0.767

Q14

Fqtigue

0.632

Q16

Amnesia

0.565

Dual Qi-Blood Vacuity (Factor 4)

Q2

Dizzy vision

0.829

1.238

6.189

64.058

0.639

Q1

Dizziness

0.744

Q11

Lack of strength in the limbs

0.569

Yang Vacuity (Factor 5)

Q10

Cold limbs

0.823

0.989

4.947

69.005

0.802

Q15

Fear of cold

0.817

  1. Q13 had excluded (factor loading <0.4 in all factors)