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This paper presents the asymptotic power function of the score test for the null hypothesis of a specified value of a common relative risk for stratified prospective studies and proposes an approximate formula for the sample size required for a specific power of the test. One can obtain a sample size formula for stratified studies with the standard null hypothesis of unity relative risk as a special case of this formula.<\/jats:p>","DOI":"10.1002\/sim.4780130109","type":"journal-article","created":{"date-parts":[[2007,4,28]],"date-time":"2007-04-28T15:16:57Z","timestamp":1177773417000},"page":"79-86","source":"Crossref","is-referenced-by-count":7,"title":["Sample size requirements for stratified prospective studies with null hypothesis of non\u2010unity relative risk using the score test"],"prefix":"10.1002","volume":"13","author":[{"given":"Jun\u2010Mo","family":"Nam","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2006,10,15]]},"reference":[{"doi-asserted-by":"crossref","unstructured":"Ad Hoc Group for the Study of Pertussis Vaccines. \u2018Placebo\u2010controlled trial of two acellular pertussis vaccines in Sweden \u2010 protective efficacy and adverse events\u2019 Lancet PRMb\/bPRM 955\u2013960(1988).","key":"e_1_2_1_2_2","DOI":"10.1016\/S0140-6736(88)91778-3"},{"doi-asserted-by":"publisher","key":"e_1_2_1_3_2","DOI":"10.1002\/sim.4780091208"},{"doi-asserted-by":"publisher","key":"e_1_2_1_4_2","DOI":"10.2307\/2531405"},{"doi-asserted-by":"publisher","key":"e_1_2_1_5_2","DOI":"10.1002\/sim.4780040211"},{"key":"e_1_2_1_6_2","first-page":"673","article-title":"Approximate tests and interval estimation of the common relative risk in the combination of 2 \u00d7 2 tables","volume":"72","author":"Gart J.","year":"1985","journal-title":"Biometrika"},{"doi-asserted-by":"publisher","key":"e_1_2_1_7_2","DOI":"10.2307\/2531848"},{"doi-asserted-by":"publisher","key":"e_1_2_1_8_2","DOI":"10.1016\/0021-9681(81)90006-0"},{"doi-asserted-by":"publisher","key":"e_1_2_1_9_2","DOI":"10.1080\/03610928808829697"},{"unstructured":"Kimura M.andHikino N.\u2018Results with a new DTP vaccine in Japan\u2019 in Karger S. 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