# description
Whether the effect estimate is an absolute effect estimate (absolute difference) or a relative effect estimate (relative difference), and the specific type of effect estimate (eg relative risk or median difference).

# concept[].definition
relative risk (a type of relative effect estimate).

# concept[].definition
odds ratio (a type of relative effect estimate).

# concept[].definition
hazard ratio (a type of relative effect estimate).

# concept[].definition
absolute risk difference (a type of absolute effect estimate).

# concept[].definition
mean difference (a type of absolute effect estimate).

# concept[].definition
standardized mean difference (a type of absolute effect estimate).

# concept[].definition
median difference (a type of absolute effect estimate).