Table 3 

Covariates for the twostage least squares (TSLS) analysis  
Regression model for pregnancy, given treatment assignment:  
Questions on the form: Description of the covariate:  
ADM_Q2  Age (years) 
ADM_Q3  Parity (previous pregnancies >24 weeks) 
ADM_Q14  Any health problems 
ADM_Q1SA  Blood pressure systolic (normal/abnormal) 
ADM_Q15B  Blood pressure diastolic (normal/abnormal) 
ADM_Q16  Body mass index (normal/abnormal) 
ADM_Q17  
Regression model for preeclampsia. Given pregnancy:  
Questions on the form: Description of the covariate:  
ADM_Q2  Age (years) 
ADM_Q3  Parity (previous pregnancies >24 weeks) 
ADM_Q14  Any health problems 
ADM_Q1SA  Blood pressure systolic (normal/abnormal) 
ADM_Q1SB  Blood pressure diastolic (normal/abnormal) 
ADM_Q16  Body mass index (normal/abnormal) 
ADM_Q17 
Seuc et al.
Seuc et al. Trials 2013 14:78 doi:10.1186/174562151478