accrual end date
Last date patients can enter the cohort (based on inclusion criteria)
accrual start date
Date from which patients can enter the cohort (based on inclusion criteria)
accrual window
Period in which patients can enter the cohort (based on inclusion criteria)
c
cohort entry date
Cohort-defining event date that makes a patient potentially eligible to join the cohort (e.g., first dispensation of a medication of interest, or admission to hospital for a certain diagnoses; based on inclusion criteria)
d
Data privacy
The protection of personal and sensitive information for the purpose of preserving the confidentiality of individuals to whom the data pertain and the integrity of the information itself.
e
end of follow-up
Last date a patient is part of the cohort; usually study end date, death date, end of health insurance coverage or when the patient experiences an outcome of interest
Episode of care
A collection of temporally sequential healthcare services that an individual receives to treat or manage a specific health condition or event.
f
Flag variable
A variable in your data set that you define to have one value until it is true, and in effect, can be used to flag certain conditions in your data set.
follow-up period
Period in which a patient can have an outcome of interest (and when time-varying covariates are observed if applicable)
g
General Propensity Score
The propensity score is the probability of treatment assignment conditional on observed baseline characteristics. The propensity score allows one to design and analyze an observational (nonrandomized) study so that it mimics some of the particular characteristics of a randomized controlled trial.
h
High-Dimensional Propensity Score
A High-Dimensional Propensity Score (HDPS) is a probability score between zero and one typically obtained from a logistic regression model that reflects the likelihood of the outcome regressed, be it the likelihood of belonging to a group or having a disease.
i
inclusion criteria
Key features of the population of interest that are used to create the study cohort
l
look-back period
Time window used to determine a patient’s characteristics at baseline and/or when exclusion criteria are applied (can vary by covariate or exclusion criteria; may or may not include the cohort entry date)
p
PROC SQLPROC SQL is a powerful Base SAS7 Procedure that combines the functionality of DATA and PROC steps into a single step. PROC SQL can sort, summarize, subset, join (merge), and concatenate datasets, create new variables, and print the results or create a new table or view all in one step!
Propensity Score MatchingPropensity score matching (PSM) is a quasi-experimental method in which the researcher uses statistical techniques to construct an artificial control group by matching each treated unit with a non-treated unit of similar characteristics. Using these matches, the researcher can estimate the impact of an intervention.
s
SASSAS is a software package that was developed by the SAS Institute. The package has a variety of uses including managing, manipulating, analyzing, and summarizing data.
study end date
Last date of data availability (also known as maximum follow-up date)
study start date
First date of data availability (also known as maximum look-back date)
