Skip to main content
. 2017 Aug 17;12(11):1892–1899. doi: 10.2215/CJN.00650117

Table 9.

Illustration of definition of stabilized inverse-probability weighting

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.