Table 3.

Total effects of birth weight, being a twin, maternal smoking, and mother’s height on systolic and diastolic blood pressure at age 9 and 18

	Birth weight	Twin	Mother’s smoking	Mother’s height
Blood pressure at age 9
Systolic (n=755)*	-0.49 (−1.62 to 0.64)	−4.26 (−7.75 to −0.77)	1.61 (0.50 to 2.73)	0.11 (0.07 to 0.14)
Diastolic (n=795)	−0.10 (−1.04 to 0.84)	−1.74 (−4.57 to 1.08)	0.54 (−0.49 to 1.57)	0.03 (−0.01 to 0.05)
Blood pressure at age 18
Systolic (n=851)	−1.17 (−2.41 to 0.06)	−4.18 (−8.12 to −0.24)	1.95 (0.54 to 3.36)	0.11 (0.06 to 0.16)
Diastolic (n=851)	1.03 (0.31 to 2.38)	1.19 (−3.10 to 5.49)	1.15 (−0.42 to 2.72)	0.05 (0 to 0.11)

^*Gestational age 37 weeks or more.