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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Breast Cancer Res Treat. 2014 Aug 24;147(2):415–421. doi: 10.1007/s10549-014-3099-z

Table 2.

Tumor characteristics of invasive breast cancer cases in the Carolina Breast Cancer Study Phase 2 according to NSAID use

No use of NSAIDs, n (%) Use of NSAIDs, n (%) p value*
Tumor stage
    Stage I 48 (44.9) 328 (41.5) 0.515
    Stage II 42 (39.3) 355 (44.9)
    Stage III 15 (14.0) 84 (10.6)
    Stage IV 2 (1.9) 23 (2.9)
    Missing 2 36
Node status
    Negative 74 (67.9) 533 (64.7) 0.510
    Positive 35 (32.1) 291 (35.3)
    Missing 0 2
Tumor size
    ≤ 2 cm 52 (50.5) 406 (52.3) 0.939
    > 2–5 cm 38 (36.9) 279 (35.9)
    > 5 cm 13 (12.6) 92 (11.8)
    Missing 6 49
ER status
    Positive 64 (62.1) 426 (54.6) 0.149
    Negative 39 (37.9) 354 (45.4)
    Missing 6 46
ER/PR status
    ER + or PR+ 72 (69.9) 485 (62.3) 0.135
    ER– and PR– 31 (30.1) 293 (37.7)
Missing 6 48
*

Chi-square test