add_observation_period_id

add_observation_period_id(
    table,
    cdm,
    *,
    index_date='cohort_start_date',
    name_observation_period_id='observation_period_id',
)

Add the observation_period_id (ordinal within person) for the observation period containing index_date.

Parameters

Name	Type	Description	Default
table	Any	Ibis table with person_id or subject_id and index_date.	required
cdm	Cdm	CDM reference (observation_period).	required
index_date	str	Column name for index date (default “cohort_start_date”).	'cohort_start_date'
name_observation_period_id	str	Output column name (default “observation_period_id”).	'observation_period_id'

Returns

Name	Type	Description
	ibis.expr.types.Table	Table with observation_period_id column.