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From:
Published online 2012 December 4. doi: 10.1371/journal.pone.0051046

Table 4

Clinical Variables Associated with MCV Excluding RBC Count and Hemoglobin.
Model adjusted for age, gender, and ethnicity(n = 3157, R2 = 0.0777)Model adjusted for all covariates(n = 2643, R2 = 0.2225)
Beta (SE)P-valueBeta (SE)P-value
Age (per year)0.0502 (0.0102)8.7×10−70.0370 (0.0107)0.0006
Gender
FemaleReferenceReference
Male1.6029 (0.2288)3.0×10−120.1477 (0.2423)0.5422
Ethnicity
European Am. vs. African Am.3.1648 (0.2496)5.5×10−362.1917 (0.2660)2.7×10−16
Hispanic vs. African Am.1.6061 (0.3336)1.5×10−61.0469 (0.3330)0.0017
Hispanic vs. European Am.−1.5588 (0.3553)1.2×10−5−1.1448 (0.3562)0.0013
BMI−0.1190 (0.0161)1.7×10−13
Ln (Ave Relative T/S)−2.4013 (0.4453)7.6×10−8
Alcohol intake (g/day)0.0474 (0.0099)1.6×10−6
Smoking
NeverReference
Past smoking0.7118 (0.2916)0.0147
Current smoking1.6046 (0.2962)6.6×10−8
Iron0.0518 (0.0032)2.3×10−55
The effect sizes (betas) are reported as mean differences in MCV associated with a one-unit increase in a quantitative predictor, or with a particular category of a qualitative predictor compared to the reference group. Iron measurements were available for 2712 of the participants; the estimated coefficients from the full model are based on this subset.