Table 3

Comparison of self-reported exposure to expert exposure assessments in participants without and with asthma

	n^*	Self-reported exposure (%)	Expert exposure assessment (%)	McNemar test (p value)	Kappa coefficient	Phi coefficient	Sensitivity	Specificity
Participants without asthma (n=177 jobs)
Formaldehyde^†	150	15.3	26.0	<0.001	0.60	0.63	53.9	98.2
Bleach, chlorine	175	39.4	48.6	<0.001	0.75	0.76	77.7	96.7
Alcohol	166	63.9	94.0	<0.0001	0.17	0.28	67.3	90.0
Quaternary ammonium^†	148	14.2	69.6	<0.0001	0.13	0.27	20.4	100.0
Ammonia	164	6.7	17.1	<0.0001	0.52	0.59	39.3	100.0
Sprays	174	39.0	34.5	0.06	0.78	0.78	91.7	88.6
Latex gloves	162	75.9	64.2	<0.0001	0.72	0.75	100.0	67.2
Participants with asthma (n=150 jobs)
Formaldehyde^†	137	38.7	40.1	NS	0.57	0.57	72.7	84.1
Bleach, chlorine	148	52.0	50.0	NS	0.91	0.91	97.3	93.2
Alcohol	147	66.0	91.8	<0.0001	0.26	0.36	71.1	91.7
Quaternary ammonium^†	117	19.7	72.6	<0.0001	0.01	0.01	20.0	81.2
Ammonia	145	8.3	20.7	<0.0001	0.51	0.59	40.0	100.0
Sprays	148	39.9	37.2	ns	0.92	0.92	98.2	94.6
Latex gloves	138	86.2	79.7	0.02	0.62	0.64	97.3	57.1

↵* Number of jobs without missing values for either of the two exposure estimates.
↵† Job classified by experts as environmentally exposed to formaldehyde (n=7 and n=6 for participants without and with asthma, respectively) and quaternary ammonium components (n=10 and n=22 for participants without and with asthma, respectively) were excluded from the analyses of each concerned specific exposure.