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. 2019 Mar 27;7(3):2325967119832399. doi: 10.1177/2325967119832399

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© The Author(s) 2019

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (http://www.creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — Degree of specialization by grade group. *Significantly different distribution in the 5th-6th grade compared with the 9th-10th and 11th-12th grades.