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).

CasesControlsTotal

Upper 𝑎 𝑖 𝑏 𝑖 𝑀 1 𝑖
Lower 𝑐 𝑖 𝑑 𝑖 𝑀 2 𝑖
Total 𝑛 1 𝑖 𝑛 2 𝑖 𝑁 𝑖