# Table 2 Inter-item Correlations on Study Day 4 (n = 92 to 97)

HFaST Item 1 2 3 4 5 6 7 8 9 10
HFaST 1 Fatigue or low energy level when performing everyday activities 1
HFaST 2 Fatigue or low energy level even while sitting or lying down 0.82 1
HFaST 3 Shortness of breath when performing everyday activities 0.62 0.67 1
HFaST 4 Shortness of breath at rest 0.53 0.68 0.75 1
HFaST 5 Shortness of breath while lying down or reclining (for example, needing to add pillows or move to a recliner to sleep) 0.56 0.68 0.74 0.91 1
HFaST 6 Sudden attacks of shortness of breath that wake you from sleeping 0.45 0.49 0.52 0.74 0.81 1
HFaST 7 Cough 0.46 0.33 0.56 0.58 0.57 0.44 1
HFaST 8 Swelling of feet, ankles, legs, or abdomen; shoes or waistband feeling tight 0.62 0.48 0.53 0.60 0.60 0.56 0.51 1
HFaST 9 Heart palpitations—rapid, fluttering, or pounding heartbeat 0.54 0.69 0.64 0.67 0.69 0.53 0.53 0.45 1
HFaST 10 Have you gained more than 2 pounds during the past 24 h or more than 5 pounds during the past 72 h? −0.05 − 0.05 −0.27 − 0.12 −0.13 − 0.15 −0.21 − 0.20 −0.15 1
1. HFaST Heart Failure Symptom Tracker
2. Note: HFaST values are as follows: 0 = Did not experience in the past 24 h, 1 = Much better than usual, 2 = Somewhat better than usual, 3 = Slightly better than usual, 4 = About the same as usual, 5 = Slightly worse than usual, 6 = Somewhat worse than usual, 7 = Much worse than usual. HFaST Item 10 values: 1 = yes, 2 = no