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Table 1 BMI (kg/m2), HRT use, and current NSAID/aspirin use reported during 1991–1994 and 1997–2001 by two population-based control groups1

From: Changing population characteristics, effect-measure modification, and cancer risk factor identification

  

1991–1994

1997–2000

p value2

  

N (%)3

N (%)

 

NSAIDs/aspirin:

No

938 (60.8)

692 (57.6)

0.02

Yes

605 (39.2)

510 (42.4)

 

HRT use:

No

364 (64.4)

188 (49.3)

<0.01

Yes

201 (35.6)

193 (50.7)

 

BMI1

≤ 23

287 (18.8)

173 (14.5)

<0.01

24–25

272 (17.8)

174 (14.6)

 

26–29

507 (33.2)

427 (35.9)

 

≥ 30

461 (30.2)

417 (35.0)

 
  1. 1Data from controls participating in population-based studies of colon and rectal cancer in Utah and Northern California [18]
  2. 2p values based on χ2 statistic from contingency tables with Mantel-Haenszel adjustment.
  3. 3Numbers vary slightly because of missing data for the various variables; HRT use is limited to data from post-menopausal women.