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. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: Clin Gastroenterol Hepatol. 2009 Jan 24;7(8):874–881. doi: 10.1016/j.cgh.2009.01.004

Table 6.

Subgroup Analysis by Study Design

Design Lymphomas Patient-Years NHL rate per 10,000 pt-years SIR* 95% CI
RCT 2 3860 5.2 2.6 0.19–35.7
Cohort 7 15,192 4.6 2.3 0.44–22.7
Case series 4 2125 18.8 9.4 1.35–104.0
*

SIR compared with SEER.