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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: J Endod. 2012 Mar 21;38(5):589–593. doi: 10.1016/j.joen.2012.02.006

Table 2.

The contingency table (N/%) for self-reported history of endodontic treatment (SRHET) in relation to the presence of endodontic treatment (ET) and apical periodontitis (AP).

SRHET Presence of ET Total Presence of AP Total
No Yes No Yes
No 131 / 94.9 7 / 5.1 138 / 60.3 73 / 93.6 5 / 6.4 78 / 60.5
Yes 16 / 17.6 75 / 82.4 91 / 39.7 33 / 64.7 18 / 35.3 51 / 39.5

Total 147 / 64.2 82 / 35.8 229 / 100 106 / 82.2 23 / 17.8 129 / 100