Fixed effects regression coefficients (within family associations) for the effect of birth order on CVD risk factors.

B: Unstandardized regression coefficient; BMI, body mass index; DBP, diastolic blood pressure; SBP, systolic blood pressure; CI, 95% confidence interval. *P<0.05; **P<0.01; ***P<0.001. Model 3: Adjusted for birth year, conscription age and conscription centre. Model 4: Additionally adjusted for maternal age. Model 5: Model 4 additionally adjusted for height. Model 6: Model 4 additionally adjusted for BMI.