Table 2.

Detailed list of add-on variables (A_m and F_n), unstandardized variable coefficients (β_m and γ_n), standardized variable coefficient (β), t-statistic and its significance (Sig) and partial correlations of the variables entered in the development of model 6, as defined in Equation 6.

Model	Variables	Unstandardized coefficients (βm, γn)		Standardized coefficient	t-Statistic	Sig	Correlations			Percent cases report add-on	Reference supporting variable
		βm or γn	SE	β			Zero order	Partial	Semipartial
Benzene (R2 = 0.469)	(Constant)	0.609	0.196		3.108	0.002
	Benzene modeled	0.140	0.082	0.096	1.696	0.091	0.316	0.093	0.068	100
	Dichotomous variables Am
	Volunteer has paints stored in the garage	1.905	0.210	0.405	9.082	0.000	0.464	0.447	0.364	7
	Car kept in the garage	1.049	0.215	0.219	4.889	0.000	0.382	0.260	0.196	7	Batterman et al. 2006
	Urban location	0.380	0.133	0.140	2.854	0.005	−0.094	0.155	0.114	38	Edwards et al. 2005
	Volunteer visited hospital	1.320	0.316	0.170	4.171	0.000	0.183	0.223	0.167	3
	Commute by electric or diesel train	0.350	0.179	0.083	1.962	0.051	0.023	0.107	0.079	10	Edwards et al. 2005
	Gas main heating	0.455	0.123	0.172	3.714	0.000	0.032	0.200	0.149	3
	Additional heating sources	2.087	0.668	0.148	3.122	0.002	0.175	0.169	0.125	60
	Time variables Fn
	Time exposed to constant or frequent ETS	0.003	0.001	0.279	5.994	0.000	0.285	0.313	0.240	15	Heavner et al. 1995
	Time commuting in a car	0.005	0.001	0.153	3.597	0.000	0.243	0.194	0.144	11
Ethylbenzene (R2 = 0.813)	(Constant)	0.981	0.198		4.944	0.000
	Ethylbenzene modeled	0.156	0.156	0.032	0.995	0.320	0.117	0.055	0.024	100
	Dichotomous variables Am
	Volunteer has paints stored in the garage	1.668	0.309	0.142	5.393	0.000	0.183	0.284	0.128	7	Ilgen et al. 2001
	Car kept in the garage	1.807	0.321	0.152	5.637	0.000	0.159	0.296	0.134	7	Song et al. 2007
	Volunteer visited hospital	2.113	0.463	0.109	4.559	0.000	0.088	0.243	0.108	3	Song et al. 2007
	Carpet has been fumigated	19.158	0.836	0.546	22.929	0.000	0.525	0.783	0.545	1	Yang et al. 2002
	New carpet	0.202	0.200	0.025	1.006	0.315	−0.015	0.055	0.024	1
	Volunteer works in a factory	3.881	0.836	0.111	4.645	0.000	0.085	0.247	0.110	3	Song et al. 2007
	Additional heating sources	3.113	1.057	0.089	2.945	0.003	0.082	0.160	0.070	1	Song et al. 2007
	Time variables Fn
	Time painting or in presence of painters	0.074	0.003	0.675	28.345	0.000	0.662	0.841	0.674	3	Ilgen et al. 2001, Song et al. 2007
Styrene (R2 = 0.868)	(Constant)	0.209	0.171		1.224	0.222
	Styrene modeled	0.796	0.248	0.064	3.208	0.001	0.035	0.172	0.064	100
	Dichotomous variables Am
	Wood burning in fireplace	2.503	0.489	0.102	5.117	0.000	0.094	0.268	0.102	2	Austin et al. 2001
	Carpet has been fumigated	31.987	0.688	0.926	46.475	0.000	0.922	0.930	0.925	1	Zuraimi et al. 2006
3-Ethenylpyridine (R2 = 0.750)	(Constant)	0.109	0.022		4.912	0.000
	3-Ethenylpyridine modeled	−0.337	0.052	−0.318	−6.472	0.000	0.370	−0.333	−0.172	100
	Dichotomous variables Am
	ETS	0.178	0.051	0.116	3.482	0.001	0.468	0.187	0.092	30	Heavner et al. 1995
	Time variables Fn
	Time in presence of ETS	0.001	0.000	0.227	3.970	0.000	0.761	0.212	0.105	30	Heavner et al. 1995
	Time exposed to constant ETS	0.003	0.000	0.215	5.204	0.000	0.711	0.273	0.138	6	Heavner et al. 1995
	Time exposed to constant or frequent ETS	0.004	0.000	0.647	9.808	0.000	0.777	0.472	0.260	15	Heavner et al. 1995
Naphthalene (R2 = 0.418)	(Constant)	0.381	0.082		4.659	0.000
	Dichotomous variables Am
	Incense burning	0.994	0.248	0.168	4.006	0.000	0.146	0.214	0.167	2
	Photocopier, fax, or printer in the house	0.306	0.135	0.097	2.272	0.024	0.205	0.123	0.095	18	Zuraimi et al. 2006
	Gas main heating	0.273	0.102	0.115	2.671	0.008	0.045	0.145	0.111	59
	Packing or unpacking clothes	1.188	0.906	0.055	1.311	0.191	0.040	0.072	0.055	1	Edwards et al. 2005
	Time variables Fn
	Inverse time carpet was replaced in kitchen	0.921	0.693	0.058	1.329	0.185	0.068	0.073	0.055	7
	Inverse time carpet was replaced in living room	0.164	0.333	0.021	0.493	0.622	0.001	0.027	0.021	7
	Inverse time packing or unpacking clothes	20.078	1.435	0.600	13.991	0.000	0.603	0.608	0.584	1	Edwards et al. 2005
1,3-Butadiene (R2 = 0.487)	(Constant)	0.115	0.036		3.232	0.001
	Dichotomous variables Am
	Visited a gasoline station	0.178	0.106	0.068	1.678	0.094	0.107	0.092	0.066	4
	Commute by bus	0.108	0.070	0.062	1.538	0.125	0.094	0.084	0.060	4	Curren et al. 2006
	Solvent use	0.112	0.135	0.034	0.834	0.405	0.117	0.046	0.033	13
	Garage connected to the kitchen	0.401	0.091	0.176	4.403	0.000	0.145	0.235	0.173	5
	Additional gas heating appliances	0.666	0.112	0.238	5.969	0.000	0.198	0.312	0.234	13
	Time variables Fn
	Time in presence of ETS	0.001	0.000	0.149	1.969	0.050	0.389	0.108	0.077	12	Heavner et al. 1995
	Time exposed to constant or frequent ETS	0.001	0.000	0.236	3.150	0.002	0.375	0.171	0.124	30	Heavner et al. 1995
	Time traveling	0.001	0.000	0.059	1.458	0.146	0.042	0.080	0.057	15	Curren et al. 2006
	Time wrapping Christmas presents and cards	0.015	0.001	0.431	10.685	0.000	0.448	0.506	0.419	1
	Inverse time since antimold use	2.001	0.338	0.241	5.925	0.000	0.247	0.310	0.232	1

Concentrations are measured in micrograms per cubic meter (μg/m ), time variables are measured in minutes, and inverse of time variables in minutes .