Table 4 Correlation among subject‐specific geometric mean levels of styrene and SO in air and blood (Spearman coefficients, p values, and numbers of observations).

	Styrene (air)	Styrene (blood)	SO (blood)
SO (air)	0.76 (<0.0001) 328	0.70 (<0.0001) 295	0.34 (<0.0001) 212
Styrene (air)		0.85 (<0.0001) 295	0.42 (<0.0001) 212
Styrene (blood)			0.49 (<0.0001) 212