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Table 3 Pearson's correlation co-efficient of association between variables for the control (lower left-hand side) and PIH (upper right-hand side) groups

From: Serum calcium and magnesium levels in women presenting with pre-eclampsia and pregnancy-induced hypertension: a case–control study in the Cape Coast metropolis, Ghana

Variable Age SBP DBP GA BMI Ca 2+ Mg 2+
Age   0.047 0.100 -0.215 0.020 -0.181 0.059
SBP 0.194   0.115 0.149 0.575 ** -0.314 -0.083
DBP 0.201 0.370 *   -0.321 0.129 -0.221 0.158
GA -0.085 -0.015 -0.166   0.329 0.038 -0.234
BMI 0.303 0.434 ** 0.068 0.011   0.045 0.151
Ca 2+ 0.179 -0.181 -0.130 0.023 0.020   0.494 **
Mg 2+ 0.147 -0.201 -0.111 -0.043 -0.113 0.841 **  
  1. *Correlation is significant at the 0.05 level (2-tailed). **Correlation is significant at the 0.01 level (2-tailed). GA: Gestational Age; BMI: Body Mass Index: DBP: Diastolic Blood Pressure; SBP: Systolic Blood Pressure. Data in boldface indicate statistical significance.