BMI mediates the association between low educational level and higher blood pressure during pregnancy in Japan

BMC Public Health

Table 3 The associations between systolic and diastolic blood pressure at mid-pregnancy and educational level (and 95% CIs) (n=923) ^*

Educational level	Unadjusted model	Basic model†	Basic model† +BMI	Basic model† +smoking	Basic model† +salt intake	Basic model† +alcohol intake	Basic model† +income	Basic model† +BW gain	Full model‡
SBP, mmHg
High	Reference	Reference	Reference	Reference	Reference	Reference	Reference	Reference	Reference
Mid	0.29 (−1.50, 2.07)	−0.0063 (−1.77, 1.76)	−0.20 (−1.92, 1.52)	0.17 (−1.60, 1.95)	−0.14 (−1.94, 1.66)	−0.18 (−1.98, 1.62)	−0.31 (−2.16, 1.54)	0.32 (−1.46, 2.10)	0.085 (−1.75, 1.92)
Low	1.52 (−0.27, 3.30)	1.84 (0.057, 3.61)	0.58 (−1.20, 2.35)	2.53 (0.66 to 4.40)	1.87 (0.045, 3.69)	1.76 (−0.057, 3.59)	1.17 (−0.73, 3.06)	1.77 (−0.035, 3.57)	0.53 (−1.48, 2.53)
DBP, mmHg
High	Reference	Reference	Reference	Reference	Reference	Reference	Reference	Reference	Reference
Mid	0.81 (−0.42, 2.03)	0.58 (−0.62, 1.78)	0.47 (−0.71, 1.66)	0.73 (−0.48, 1.94)	0.40 (−0.82, 1.62)	0.37 (−0.86, 1.59)	0.14 (−1.10, 1.37)	0.69 (−0.53, 1.90)	0.17 (−1.08, 1.41)
Low	0.83 (−0.39, 2.06)	0.99 (−0.22 to 2.20)	0.30 (−0.92, 1.52)	1.44 (0.17 to 2.72)	1.10 (−0.13 to 2.34)	1.02 (−0.22, 2.25)	0.42 (−0.85, 1.69)	1.00 (−0.23, 2.22)	0.06 (−1.31, 1.42)

^* Estimates denote difference in BP (mmHg) between low, mid and high educational level.
†Basic model: adjusted for gestational age at BP measurement, maternal age, parity, past medical history of hypertension, pregnancy-induced hypertension, diabetes mellitus, renal disease, family history of hypertension.
‡Full model: Basic model+ pre-pregnancy BMI, smoking, salt intake, alcohol intake, income, BW gain until mid-pregnancy.
Abbreviations: SBP, systolic blood pressure; DBP, diastolic blood pressure, BMI, pre-pregnancy body mass index; BW gain, body weight gain until mid-pregnancy.

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