Table 2.

Summary of published cohort studies examining mortality from NHL as associated with PCB exposure. Note the cohort described in Prince et al., [50] were included in the Prince et al., [51] study. Here, the standardized mortality ratio (SMR) was calculated as an indirect adjustment method where the observed number of events (deaths) in each occupational cohort is compared with the number of expected events (based on a “standard” rate).

Study	PCB product exposure	Chlorine (%)	PCB air sampling (μg/m3)	Cohort size (n)	Deaths	Cancer deaths	NHL deaths	Mortality rate (SMR)
Prince et al., 2006 [50]	Aroclor 1254	54	24–476 & 50–1,260	2,572	798	218	10	1.31
	Aroclor 1242	42
	Aroclor 1016	41
Prince et al., 2006 [51]	Aroclor 1254	54	24–476 & 50–1,260	14,458	3,417	1015	35	0.98
	Aroclor 1242	42
	Aroclor 1016	41
Ruder et al., 2006 [52]	Aroclor 1242	42	7–339 & 62–290	3,569	547	171	9	1.23
	Aroclor 1016	41