Table 3.

Construct validity: correlations^a between selected PRO items among 278 outpatients with chronic kidney disease

	Daily activities	Renal function	Feeling aversion to food	Quality of life	Interpretation of correlation (r)	Shape of relationship
Nocturnal awakening	r = 0.31 p < 0.0001				Hypothesis rejected	Negative linear
Self-rated health		r = 0.19b p = 0.004			Hypothesis accepted	Negative linear
Lack of appetite			r = 0.77 p < 0.0001		Hypothesis accepted	Negative linear
Daily activities				r = 0.58 p < 0.0001	Hypothesis accepted	Negative linear

^aSpearman correlation coefficients (r) were calculated

^bn = 233