Table 9.
Confounder: eGFR | Exposure: Hypertension | |
---|---|---|
Yes | No | |
High | P(hypertension=Yes when eGFR=High)=25% | P(hypertension=No when eGFR=High)=75% |
Unstabilized IPW=1/25%=4 | Unstabilized IPW=1/75%=4/3 | |
P(hypertension=Yes)=37.5% | P(hypertension=No)=62.5% | |
Stabilized IPW=4×37.5%=1.5 | Stabilized IPW=(4/3)×62.5%=0.83 | |
Low | P(hypertension=Yes when eGFR=Low)=50% | P(hypertension=No when eGFR=Low)=50% |
Unstabilized IPW=1/50%=2 | Unstabilized IPW=1/50%=2 | |
P(hypertension=Yes)=37.5% | P(hypertension=No)=62.5% | |
Stabilized IPW=2×37.5%=0.75 | Stabilized IPW=2×62.5%=1.25 |
P, probability of; IPW, inverse probability weight.