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. 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 3.

Mean levels of plasma selenium measurements by risk area in males from Nariño, Colombia (2006)

Gastric cancer risk area
Plasma levels Low risk n=45 High risk n=44 Unadjusted difference Two-tailed p valuea Adjusted differenceb Two-tailed p valueb Adjusted differencec
Mean(SD) Mean(SD) (SE) (SE) (SE)
Plasma selenium (ug/dL) 12.1 (1.4) 10.7 (1.2) −1.4 (0.3) <0.001 −1.7 (0.3) <0.001 −1.3 (0.5) 0.006
Sepp1 (ug/ml) 5.2 (1.10) 5.8 (0.92) 0.6 (0.2) 0.009 0.6 (0.3) 0.017 0.4 (0.4) 0.266
GPx activity (nmol/min/ml plasma) 110.5 (17.2) 107.3 (16.9) −3.2 (3.6) 0.379 −3.2 (4.0)d 0.677d −1.0 (6.0)e 0.869e
Other selenium pool 5.0 (1.8) 3.0 (1.0) −2.0 (0.3) <0.001 −2.4 (0.4) <0.001 −1.7 (0.5) 0.002

Abbreviations: SD, standard deviation; SE, standard error; Sepp1: selenoprotein-P; GPx: extracellular glutathione peroxidase

a

P-values for difference from t-test.

b

Differences and p-values from linear regression models adjusted for vitamins, schooling, household appliances index and household conditions index.

c

Differences and p-values from linear regression models adjusted for vitamins, schooling, household appliances index, household conditions index, and consumption of fresh fish and seafood.

d

Differences and p-values from linear regression models adjusted for BMI, vitamins, schooling, household appliances index and household conditions index.

e

Differences and p-values from linear regression models adjusted for BMI, vitamins, schooling, household appliances index, household conditions index, and consumption of fresh fish and seafood.