Table 1.

Comparison of Bla g 2 units in publications with conversion factors applied (from Units/g to μg/g).

					Converted Bla g 2 (μg/g)
First author (year)	Study description	Location of sampling	Measure reported	Bla g 2 concentration (as published)	Via a single conversion factor	Assessed by linear regression equation
Call et al (1992)	Children with asthma in Atlanta, GA (n=35)	Multiple areas in home	Median	20–30 U/g	0.472–0.708	0.559–0.827
Gelber et al (1992)	ER patients (with/without asthma in Delaware (n=51, with visual evidence of cockroaches)	Kitchen	Median	30 U/g	0.708	0.827
Sarpong et al (1996)	Children with asthma in Baltimore (urban=15)(suburban=7)	Child’s Bed and Bedroom floor	Arithmetic mean	2.8U/g	0.066	0.098
				2.4 U/g	0.057	0.087
de Blay et al. (1997)	Homes (with reports of cockroaches) in Strasbourg, France (n=9)	Bed	Geometric mean	3 U/g	0.071	0.103
		Kitchen		497 U/g	11.729	13.342
Stelmach et al (2002)	Children with asthma in Poland	Child’s Bed and Bedroom floor (n=16)	Arithmetic mean	9.37 U/g	0.221	0.274
		Kitchen (n=27)		75 U/g	1.770	2.033
Chew et al. (2003)	Birth cohort in inner-city NYC	Child’s Bed (n=124)	Geometric mean	0.07 μg/g	0.041x	0.069
		Kitchen (n=121)		0.3μg/g	0.3μg/g	0.043
Brugge et al. (2003)	Children with asthma living in public housing in Boston (n=9)	Kitchen	Arithmetic mean	2.5 U/g	0.059	0.090
Chew et al. (2006)	Residents living in public housing in NYC	Bed (n=269)	Median	1.8 U/g	0.042	0.071
		Kitchen (n=321)		35.9 U/g	0.847	0.985
Peters et al (2007)	Children with asthma living in public housing (Boston, n=46)	Child’s Bed	Median	1.99 U/g	0.047	0.076
		Kitchen		198 U/g	4.673	5.329
Rosenfeld et al. (2008)	Birth cohort in NYC ( n=221)	Mother’s Bed	Geometric mean	1.46 U/g	0.034	0.062
			Median	0.5 U/g	0.012	0.036
Chew et al. (2008)	Children with asthma that attended Head Start daycare in inner-city NYC (n=330)	Child’s Bed	Geometric mean	4.8 U/g	0.113	0.151
		Kitchen		15.3 U/g	0.361	0.433
Olmedo et al, (2011)	Children with same health insurance plan living in NYC	High asthma prevalence neighborhood, (n=120)	Geometric mean	0.037 μg/g	n/a d	n/a d
		Low asthma prevalence neighborhood, n=120)		0.022 μg/g
Lin et al. (2011)	Children in Buffalo, NY (n=99)	Bedroom	Median	BDa	n/a	n/a
Breysse et al. (2011)	Children with asthma living in Milwaukee, WI (n=121)	TV room	Median	BDb	n/a	n/a
Perry et al. (2012)	Asthmatic children living in Rural Arkansas (n=109)	Child’s Bedroom	Median	BDc	< 0.024	< 0.049
Permaul et al. 2012	School study & Children with asthma in Boston	Schools (n=12)	Geometric mean	0.200 μg/g	n/a d	n/a d
		Homes (Child’s bed and bedroom floor) (n=118)		0.200 μg/g

^aBelow limit of detection (BD) value = not reported in manuscript

^bBelow limit of detection (BD) value = 0.02 μg/g

^cBelow limit of detection (BD) value = 1 U/g

^dThis value was not applicable because the Universal Allergen Standard (UAS) was used in the MARIA (or ELISA) for estimation of Bla g 2 concentrations.