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