Table 4.

Construct Validity: Correlation between BPD control sum score and acute care use for overall and by subgroups

Acute Care Events	Subgroups	Subjects (N)	Spearman Correlation Coefficient (Sum Score)	P Value
Number of outpatient visits for respiratory illnesses (sick visits)	Overall	1033	−0.407	<0.001
	Non-white	440	−0.420	<0.001
	Hispanic	117	−0.459	<0.001
	Mild/Moderate BPD	308	−0.381	<0.001
	Severe BPD	692	−0.423	<0.001
	<3 years old	831	−0.383	<0.001
	3-5 years old	150	−0.429	<0.001
	≥6 years old	93	−0.447	<0.001
Number of emergency department visits	Overall	1035	−0.306	<0.001
	Non-white	439	−0.323	<0.001
	Hispanic	118	−0.460	<0.001
	Mild/Moderate BPD	310	−0.290	<0.001
	Severe BPD	692	−0.304	<0.001
	<3 years old	832	−0.319	<0.001
	3-5 years old	151	−0.314	<0.001
	≥6 years old	94	−0.217	0.036
Number of hospital readmissions	Overall	1031	−0.274	<0.001
	Non-white	438	−0.282	<0.001
	Hispanic	119	−0.206	0.025
	Mild/Moderate BPD	308	−0.264	<0.001
	Severe BPD	690	−0.268	<0.001
	<3 years old	828	−0.315	<0.001
	3-5 years old	150	−0.193	0.018
	≥6 years old	94	−0.105	0.31
Number of antibiotic courses	Overall	1019	−0.248	<0.001
	Non-white	439	−0.276	<0.001
	Hispanic	119	−0.185	0.046
	Mild/Moderate BPD	302	−0.211	<0.001
	Severe BPD	684	−0.247	<0.001
	<3 years old	820	−0.214	<0.001
	3-5 years old	147	−0.336	<0.001
	≥6 years old	93	−0.363	<0.001
Number of systemic steroid courses	Overall	1012	−0.351	<0.001
	Non-white	436	−0.413	<0.001
	Hispanic	111	−0.282	0.003
	Mild/Moderate BPD	305	−0.348	<0.001
	Severe BPD	675	−0.330	<0.001
	<3 years old	811	−0.311	<0.001
	3-5 years old	149	−0.409	<0.001
	≥6 years old	93	−0.370	<0.001