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Table 1 Overview of the four combinations of first- and second-phase data evaluated in this paper

From: Efficiency of two-phase methods with focus on a planned population-based case-control study on air pollution and stroke

 

First-phase registry data

Second-phase interview and measurement data

Type of design

Disease status

Residential area

Exposure

Exposure

Covariates

1. No first-phase exposure data (method 1)

Individual

Individual

-

Individual

Individual

2. First- and second-phase exposure data (method 2 and method 4)

Individual

Individual

Area

Individual

Individual

3. No first-phase exposure data (method 3)

Individual

Individual

-

Individual

Individual