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Table 4 Threshold effect analysis of birth weight and DBP using two-precise linear regression

From: Birth weight influences differently on systolic and diastolic blood pressure in children and adolescents aged 8–15

DBP

Adjustedβ(95% CI), p

age >  = 13 years

 Fitting by a standard linear model

-0.00 (-0.03, 0.02) 0.7811

 Fitting by two precise linear model

  Inflection point

105

 birthweight < 105 oz

0.01 (-0.04, 0.06) 0.7194

 birthweight > 105 oz

-0.01 (-0.05, -0.03) 0.0322

 Log-likelihood ratio

0.583

Mexican American

 Fitting by a standard linear model

-0.01 (-0.06, 0.03) 0.5586

 Fitting by two precise linear model

 

  Inflection point

105

 birthweight < 105 oz

0.01 (-0.28, 0.19) 0.8437

 birthweight > 105 oz

-0.13 (-0.51, -0.07) 0.0258

 Log-likelihood ratio

0.026

  1. Sex, age, race/ethnicity, ratio of family income to poverty, height, weight, BMI, waist circumference, TG, TC, LDL, FBG, UA, Cr, BUN, glycohemoglobin and mothers' age when born were adjusted