Which ICD-9-CM codes should be used for bronchiolitis research?

Table 4 Comparison of findings in between broad and narrow categories with comparison studies

	Diagnosis	Subject source	Age limit (months)	Study numerator	Study denominator	%
Fever	Broad	All	24	25,514	48,269	52.9
	Broad	All	12	19,107	35,645	53.6
	Narrow	All	24	20,439	22,781	89.7
	Narrow	All	12	15,638	17,474	89.5
	Walsh 2004 [11]	Inpatient	24	28	118	23.7
	Chee 2010 [12]	ED	18	206	640	32.6
	Plint 2004 [8]	ED	12	75	237	31.6
	Ecochard-Dugelay [13]	ED	24	448	821	54.5
Gender	Broad	All	24	26,638	48,269	55.2
	Broad	All	12	19,713	35,645	55.3
	Narrow	All	24	11,909	22,781	52.3
	Narrow	All	12	9189	17,474	52.3
	Walsh 2004 [11]	Inpatient	24	70	118	59.1
	Chee 2010 [12]	ED	18	371	640	57.97
	Corneli [14]	ED	12	368	598	61.5
	Plint [8]	ED	12	140	237	59.1
Age				Study N	Mean	Median
	Broad	All	24	48,269	8.7	7.4
	Broad	All	12	35,645	5.8	6.0
	Narrow	All	24	22,781	8.3	7.0
	Narrow	All	12	17,474	5.9	5.6
	Walsh 2004 [11]	Inpatient	24	118	6.0
	Chee 2010 [12]	ED	18	640	6.4	4.8
	Corneli [14]	ED	12	598		5.1
	Plint 2004 [8]	ED	12	237		5.0
	Plint 2009 [15]	ED	12	800		5.0

Comparison of findings in between broad and narrow diagnosis codes with comparison studies which did not rely on ICD coding for subject inclusion. ED; emergency department

ISSN: 1471-2288