Table 3.

Accuracy of the questionnaire on passive smoking using the urinary cotinine cut-off concentration of 0.31 µg/g-creatinine (n = 85,103).

		Partner Smoking		Passive Smoking 7 Days		≥4 Days		≥2 Days		≥1 Day
		≥COV	<COV	≥COV	<COV	≥COV	<COV	≥COV	<COV	≥COV	<COV
Questionnaire Response	Yes	23,464	14,602	7734	1178	10,605	2262	15,067	4687	19,797	10,294
	No	11,413	35,624	27,143	49,048	24,272	47,964	19,810	45,539	15,080	39,932
Sensitivity		0.673		0.222		0.304		0.432		0.568
Specificity		0.709		0.977		0.955		0.907		0.795
Positive Predictive Value		0.616		0.868		0.824		0.763		0.658
Negative Predictive Value		0.757		0.644		0.664		0.697		0.726