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Table 2 Experimental design

From: Systematic review and validity assessment of methods used in discrete choice experiments of primary healthcare professionals

Criteria Category Number of studies %
Type of design Full factorial 1 2.9%
Fractional factorial 19 55.9%
“Efficient design” 6 17.6%
Bayesian efficient design 5 14.7%
Not reported 3 8.8%
Generation of choice sets Software 22 64.7%
Manual 2 5.9%
Not reported 9 26.5%
Design aims Level balance 7 14.7%
Minimal overlap 3 8.8%
Orthogonality 14 41.2%
Other 1 2.9%
Design efficiency D-Efficient 16 47.1%
Unclear or not reported 18 52.9%
Blocked design Blocked 27 79.4%
No blocking 3 8.8%
Unclear or not reported 4 11.8%