Psychometric validation and testing of the 10-item pediatric daily chest-related electronic patient reported outcome (ePRO) diary

Journal of Patient-Reported Outcomes

Table 4 Exploratory factor analysis of chest-related ePRO morning and afternoon diary items

	Factor loadings
Items	Total sample (N = 195)	6–11 year olds (n = 89)	12+ year olds (N = 106)
Morning items
Morning 1 (difficulty breathing)	0.888	0.858	0.858
Morning 2 (chest tightness)	0.886	0.858	0.858
Morning 3 (chest pain)	0.778	0.718	0.718
Morning 4 (chest heaviness)	0.878	0.879	0.879
Morning 5 (chest full of mucus)	0.865	0.809	0.809
Morning 6 (chest stuffed up)	0.910	0.889	0.889
Morning 7 (chest clogged up)	0.942	0.903	0.903
Morning 8 (clear chest)	0.891	0.891	0.891
Morning 9 (clear throat)	0.766	0.789	0.789
Morning 10 (cough up mucus/goo)	0.802	0.779	0.779
Model fit indices
CFI	0.990	0.990	0.994
RMSEA	0.113	0.095	0.112
SRMR	0.035	0.044	0.039
Afternoon items
Afternoon 1 (difficulty breathing)	0.904	0.907	0.913
Afternoon 2 (chest tightness)	0.929	0.940	0.923
Afternoon 3 (chest pain)	0.832	0.811	0.863
Afternoon 4 (chest heaviness)	0.892	0.871	0.921
Afternoon 5 (chest full of mucus)	0.886	0.836	0.940
Afternoon 6 (chest stuffed up)	0.924	0.907	0.970
Afternoon 7 (chest clogged up)	0.938	0.919	0.952
Afternoon 8 (clear chest)	0.874	0.823	0.926
Afternoon 9 (clear throat)	0.786	0.833	0.744
Afternoon 10 (cough up mucus/goo)	0.836	0.788	0.872
Model fit indices
CFI	0.987	0.980	0.995
RMSEA	0.135	0.147	0.114
SRMR	0.035	0.051	0.041