Table 2

Comparison of ever lead exposure determined by expert assessment with exposure determined by a job exposure matrix for meningioma cases and controls in the NCI Brain Tumour Study

	Overall				ALAD1				ALAD2
	Expert				Expert				Expert
	JEM	0	1	U	JEM	0	1	U	JEM	0	1	U
	0^*	364	122	2	0	298	100	2	0	66	22	0
	1^*	28	134	0	1	22	111	0	1	6	23	0
	U^*	4	2	0	U	2	1	0	U	2	1	0

Sensitivity^†		0.52				0.53				0.51
Specificity^†		0.93				0.93				0.92
% Agreement		76				76				74
κ		0.47				0.48				0.43

↵* 0=never, 1=ever, U=unknown.
↵† Restricted to non-missing data.