Table 6

Results (regression coefficients [b] and 95% confidence intervals [95% CI]) of univariate regression analyses for sex, age, BMI status, SES, measured weight, measured height, measured WC and health-related factors in relation to differences (bias) between measured and self-reported BMI, body weight, body height and WC

Bias BMI

Bias body weight

Bias body height

Bias WC


b

95% CI

b

95% CI

b

95% CI

b

95% CI


Sex

-0.01

-0.11, 0.08

0.25*

0.03, 0.47

0.02

-0.16, 0.20

-1.13*

-2.21, -0.04

Age

0.03

-0.06, 0.12

0.14

-0.07, 0.35

0.03

-0.14, 0.20

1.23*

0.24, 2.21

BMI status

0.30

0.21, 0.39

0.49

0.26, 0.71

-0.30

-0.47, -0.12

0.25

-0.79, 1.30

SES

-0.20

-0.28, -0.10

-0.46

-0.67, -0.25

0.09

-0.08, 0.27

-0.93

-1.94, 0.09

Measured weight (kg)

0.01

0.01, 0.01

0.02

0.02, 0.03

-0.01

-0.01, -0.00

0.01

-0.04, 0.03

Measured height (m)

-0.00

-0.01, 0.00

0.01

-0.00, 0.02

0.00

-0.01, 0.01

-4.35

-9.78, 1.07

Measured WC (cm)

0.08

0.02, 0.13

Smoking status

-0.04

-0.16, 0.09

-0.21

-0.50, 0.09

-0.07

-0.30, 0.17

-0.27

-1.69, 1.15

Medication use

0.16

0.04, 0.28

0.26

-0.02, 0.54

-0.20

-0.43, 0.02

-0.45

-1.94, 1.03

Frequency of weighing

-0.03

-0.12, 0.06

-0.05

-0.26, 0.16

0.08

-0.09, 0.25

0.03

-0.97, 1.02

Losing weight attempts

1 to 3 attempts

0.05

-0.06, 0.15

0.13

-0.12, 0.37

0.05

-0.14, 0.24

-0.30

-1.49, 0.89

≥ 4 attempts

0.09

-0.04, 0.21

-0.10

-0.40, 0.19

-0.18

-0.41, 0.06

0.93

-0.45, 2.31


*†‡ significant different from the estimate of the reference group (i.e., females, low age, overweight, low SES, non-smoking, no medication use, low frequency of weighing oneself, no attempts to loose weight) or from 0 for measured body weight, height, and WC (* p < 0.05; † p < 0.01; ‡ p < 0.001)

Dekkers et al. BMC Medical Research Methodology 2008 8:69   doi:10.1186/1471-2288-8-69

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