. Author manuscript; available in PMC: 2009 May 1.

Published in final edited form as: Arch Med Res. 2008 Mar 10;39(4):443–451. doi: 10.1016/j.arcmed.2007.12.004

Table 5.

Mean differences of GPx activity according to body mass index by risk area in males from Nariño, Colombia (2006)

	Gastric cancer risk area
Variables	Low-risk n=43		High risk n=44		Total n=87

	Difference	P value	Difference	P value	Difference	P value
Unadjusted mean differences
Normal vs. overweight	−8.8	0.155	−12.8	0.018	−10.7	0.008
Normal vs. obese	−14.6	0.027	−8.5	0.474	−11.6	0.027
p-trent ^a(excluding underweight men)	0.022		0.035		0.005
Adjusted mean differences
Normal vs. overweight	−8.0	0.268	−13.2	0.015	−11.3	0.005
Normal vs. obese	−16.7	0.037	−9.4	0.423	−16.7	0.004
p-trend^b (excluding underweight men)	0.034		0.028		<0.001

P-values from simple linear regression models

P-values from linear regression models adjusted for age, smoking, schooling, household appliances index and household conditions index.