Examining validity of body mass index calculated using height and weight data from the US driver license

BMC Public Health

Table 3 Estimation of relative risks of type II diabetes using continuous and categorical values of BMI_C and BMID

	Model 1				Model 2				Model 3				Model 4
	Parameter Estimate	Relative Risk	95% Relative Risk Confidence Interval		Parameter Estimate	Relative Risk	95% Relative Risk Confidence Interval		Parameter Estimate	Relative Risk	95% Relative Risk Confidence Interval		Parameter Estimate	Relative Risk	95% Relative Risk Confidence Interval
BMI_C	0.71***	2.04	1.96	2.12
BMI_D					0.74***	2.09	2.01	2.18
Categorical BMI _C
Underweight									−0.61*	0.54	0.33	0.89
Overweight									0.60***	1.82	1.62	2.03
Type I obesity									1.25***	3.47	3.09	3.90
Type II/III obesity									1.91***	6.78	6.02	7.63
Categorical BMI _D
Underweight													−0.55*	0.58	0.36	0.92
Overweight													0.76***	2.15	1.94	2.37
Type I obesity													1.43***	4.18	3.74	4.67
Type II/III obesity													2.09***	8.07	7.13	9.14

Note. Subscript _C is used to denote BMI calculated using the clinical height and weight values. Subscript _D is used to denote BMI calculated using the height and weight values obtained from the DLD. Continuous BMI _C and BMI _D included in Models 1 and 2 were scaled. Normal weight (BMI between 18.5 and 24.9 kg/m ² ) is a reference category in Models 3 and 4. All models include birth year, sex, education, race and ethnicity as additional covariates (estimates not shown). Significant results are indicated as follows: * p ≤ 0.05, ** p ≤ 0.01, ***p ≤ 0.001

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