Table 5.

Construct validity correlations (n=51–52)

HPT-SD score	Correlation coefficient (r)
	FACIT-Fatigue	FACT-Cog impairments	FACT- Cog impact	FACT-Cog comments	FACT- Cog abilities	HADS depression	HADS anxiety
Item 1. Muscle cramps	–0.53	–0.41	–0.59	–0.37	–0.45	0.33	0.33
Item 2. Tingling	–0.51	–0.34	–0.46	–0.29	–0.31	0.42	0.36
Item 3. Numbness	–0.50	–0.40	–0.54	–0.42	–0.48	0.47	0.49
Item 4. Muscle spasms or twitching	–0.54	–0.43	–0.61	–0.44	–0.37	0.40	0.37
Item 5. Feelings of heaviness in arms or legs	–0.61	–0.57	–0.54	–0.52	–0.64	0.50	0.47
Item 6. Physical fatigue	–0.78	–0.48	–0.59	–0.43	–0.46	0.49	0.34
Item 7. Slowed or confused thinking (brain fog)	–0.57	–0.68	–0.58	–0.68	–0.62	0.49	0.30
Item 8. Anxiety	–0.53	–0.57	–0.49	–0.61	–0.57	0.64	0.63
Item 9. Sadness or depression	–0.59	–0.49	–0.54	–0.54	–0.52	0.63	0.48
Item 10. Impact sleep	–0.40	–0.44	–0.52	–0.31	–0.35	0.28	0.23
Item 11. Impact exercise	–0.67	–0.59	–0.59	–0.62	–0.49	0.62	0.51
Item 12. Impact work	–0.67	–0.59	–0.75	–0.53	–0.57	0.54	0.58
Item 13. Impact relationships	–0.51	–0.45	–0.59	–0.53	–0.47	0.52	0.52
HPT-SD Symptom subscale score	–0.70	–0.57	–0.67	–0.55	–0.58	0.54	0.46
(1: Muscle crampsa; 2: Tingling; 3: Numbness; 4: Muscle spasms or twitching; 5: Feelings of heaviness in arms; 6: Physical fatigue; 7: Slowed or confused thinking)
HPT-SD Impact subscale score	–0.66	–0.60	–0.71	–0.55	–0.54	0.57	0.54
(10: Sleep; 11: Exercise; 12: Work; 13: Relationships)

Notes: Correlations in bold indicate a priori hypotheses.

^aTo calculate the HPT-SD Symptom subscale, item 1 was rescaled from an 11-point response scale to a 5-point response scale ranging from 0 to 4.

Abbreviations: FACIT-Fatigue, Functional Assessment of Chronic Illness Therapy–Fatigue; FACT-Cog, Functional Assessment in Cancer Therapy–Cognitive Function; HADS, Hospital Anxiety and Depression Scale; HPT-SD, Hypoparathyroidism Symptom Diary.