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. 2016 Jul 19;6(7):e011985. doi: 10.1136/bmjopen-2016-011985

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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(A) The effect of 2–5 attributes on relative d-efficiency (%) across different choice tasks for designs with two alternatives and two-level attributes. (B) The effect of 6–10 attributes on relative d-efficiency (%) across different choice tasks for designs with two alternatives and two-level attributes. (C) The effect of 11–15 attributes on relative d-efficiency (%) across different choice tasks for designs with two alternatives and two-level attributes. (D) The effect of 16–20 attributes on relative d-efficiency (%) across different choice tasks for designs with two alternatives and two-level attributes.