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. 2022 May 17;22:555. doi: 10.1186/s12885-022-09652-8

Table 1.

Results of cluster analysis of lung cancer cases in Pennsylvania developed between 2010 and 2017

Cluster Averaged population size Years Detected County Observed cases Expected cases RR LLR
1 1,276,868 2010–2013 Delaware, Montgomery and Philadelphia 3,557 2,676 1.4 136.6
2 1,260,363 2010–2013 Allegheny, Fayette, Greene, Washington and Westmoreland 4,601 3,823 1.2 78.6
3 3,772 2014–2016 Mifflin 30 6 5.2 25.3
4 108,756 2013–2016 Luzerne 448 333 1.4 18.1
5 184,572 2010–2012 Dauphin, Cumberland and York 454 338 1.3 17.9