Table 1.
A Case-Cohort Data Structure for a Hypothetical Case-Cohort Study With 2 Casesa
| ID | Variable | ||||
|---|---|---|---|---|---|
| A | T | S | Y | Z | |
| 1 | 38.4 | 86.6 | 1 | 0 | 0.8 |
| 2 | 35.0 | 81.1 | 1 | 0 | 1.0 |
| 3 | 29.3 | 77.6 | 1 | 0 | 1.1 |
| 4 | 31.8 | 77.4 | 1 | 0 | 0.0 |
| 5 | 27.8 | 78.5 | 1 | 0 | 1.3 |
| 6 | 53.9 | 90.0 | 1 | 0 | 0.0 |
| 7 | 42.5 | 87.1 | 1 | 0 | 0.0 |
| 8 | 25.6 | 77.1 | 1 | 0 | 0.0 |
| 9 | 43.0 | 77.9 | 0 | 1 | 0.0 |
| 10 | 37.7 | 76.8 | 1 | 1 | 1.6 |
Abbreviation: ID, identifier.
a “ID” is a unique identifier for each study participant; A and T denote study entry and exit times, respectively; S is a binary variable that takes the value 1 if the person is a member of the subcohort and 0 otherwise; Y is the binary outcome variable; and Z is an explanatory variable of interest.