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These portfolios included (1) Sports Only, (2) Academics Only, (3) School Only, (4) Performance Only, (5) Multiple Activities, and (6) Non\u2010Participation. Findings indicated that youth demographic characteristics and school size differentiated between different kinds of activity participation as well as nonparticipation. More detailed activity portfolios were also identified that were complex and demonstrate the difficulty of examining participation beyond larger, more inclusive groupings. The Multiple Activity portfolio emerged as a unique group worthy of further examination. Characteristics of non\u2010participators included: lower socioeconomic status, lower grades, and attended larger schools. Hispanic adolescents were also less likely to participate in school\u2010based extracurricular activities. Findings from this study inform ecological models of adolescent development as well as school and social policy.<\/jats:p>","DOI":"10.1016\/j.adolescence.2006.03.004","type":"journal-article","created":{"date-parts":[[2006,5,9]],"date-time":"2006-05-09T17:09:17Z","timestamp":1147194557000},"page":"313-332","source":"Crossref","is-referenced-by-count":113,"title":["Profiles and portfolios of adolescent school\u2010based extracurricular activity participation"],"prefix":"10.1002","volume":"30","author":[{"given":"A.F.","family":"Feldman","sequence":"first","affiliation":[{"name":"Public\/Private Ventures 2000 Market Street, Suite 600 Philadelphia Pennsylvania 19103 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.L.","family":"Matjasko","sequence":"additional","affiliation":[{"name":"The University of Texas at Austin USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,5,5]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1080\/00222216.1992.11969889"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1177\/0743558401165002"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1023056425648"},{"key":"e_1_2_7_5_1","unstructured":"Bearman D. 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