Table 3.

Results of the longitudinal models based on data at both 12 and 15 years of age. All covariates are continuous except sex, maternal hypertension during pregnancy and age at which BP was measured. The age-specific slopes for MeHg (last two lines) were obtained from refitting the same model with the MeHg by age interaction reparameterized.

	Diastolic BP (mm Hg)		Systolic BP (mm Hg)
Variable	Slope (SE)	p	Slope (SE)	p
Sex (boy)	−2.25 (.50)	<0.001	1.17 (.68)	0.08
MeHg (ppm)	−0.03 (.07)	0.62	0.07 (.09)	0.46
Birth weight (kg)	−1.13 (.49)	0.02	−0.82 (.67)	0.22
BMI (kg/m2)	0.71 (.06)	<0.001	0.89 (.08)	<0.001
Height (cm)	0.16 (.03)	<0.001	0.45 (.04)	<0.001
Maternal hypertension (yes)	2.58 (.91)	<0.01	5.59 (1.24)	<0.001
Age at testing (15 years)	−2.07 (.78)	0.01	−2.60 (1.01)	0.01
MeHg * age	0.20 (.09)	0.02	0.03 (.11)	0.79
MeHg
12 years	−0.03 (.07)	0.62	0.07 (.09)	0.46
15 years	0.17 (.07)	0.02	0.10 (0.10)	0.32

BP=blood pressure, SE = standard error, MeHg=methylmercury, ppm=parts per million, BMI=body mass index.