Plasma Levels of Polychlorinated Biphenyls, Non-Hodgkin Lymphoma, and Causation

Table 3

Notation for the calculation of Mantel-Haenszel-adjusted odds ratios from the published case-control studies reporting association of NHL and PCB blood content for specific congeners. Here, “exposed” and “unexposed” populations noted in traditional meta-analyses were replaced with “upper” and “lower” acknowledging the upper and lower percentiles of exposure reported in the literature, respectively. The subscript “𝑖” indicates each stratum (published congener).

	Cases	Controls	Total
Upper	𝑎𝑖	𝑏𝑖	𝑀1𝑖
Lower	𝑐𝑖	𝑑𝑖	𝑀2𝑖
Total	𝑛1𝑖	𝑛2𝑖	𝑁𝑖