Table 3. Internal consistency reliability for HDQ items (n = 243).

HDQ Items	HDQ Severity Scale		HDQ Episodic Scale
	Cronbach’s Alpha (Raw values)	95% confidence interval	Kuder-Richardson Statistic (Raw values)	95% confidence interval
HDQ Items (all)	0.96	0.96, 0.97	0.95	0.94, 0.96
Physical Symptoms and Impairments	0.87	0.85, 0.90	0.84	0.80, 0.88
Cognitive Symptoms and Impairments	0.85	0.80, 0.90	0.74	0.66, 0.83
Mental and Emotional Health Symptoms and Impairments	0.93	0.91, 0.94	0.90	0.87, 0.92
Uncertainty	0.90	0.88, 0.92	0.91	0.89, 0.94
Difficulty with Day-to-Day Activities	0.90	0.86, 0.93	0.82	0.73, 0.91
Challenges to Social Inclusion	0.87	0.84, 0.90	0.84	0.79, 0.89

95% Confidence Interval: asymptotically distribution free (ADF) for non-normal data.

Median imputation of episodic scores; >0.8 defined as acceptable for individual patients