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Table 2 Quality scoring based on the Newcastle-Ottawa quality assessment scale: case control studies

From: A systematic review of CD14 and toll-like receptors in relation to asthma in Caucasian children

First author Year S1 S2 S3 S4 C1a C1b E1 E2 E3 OQ
Bieli † [10] 2007 - * * - * * * * * +
Bjornvold [38] 2009 */- * * * - - NA NA - +/−
Choudhry [40] 2005 - - * - * * - * - +/−
Daley [21] 2009 - */- * - - - NA NA - +/−
Eder † [25] 2004 - * * - * * * * - +/−
Ege † [22] 2007 - * * - * * * * * +
Fageras Bottcher † [39] 2004 * - - - * * * * - +/−
Genuneit [46] 2009 - * * */- * - NA NA - +/−
Heinzmann [12] 2003 * * * - - - NA NA - +/−
Heinzmann [58] 2010 * - * - - - NA NA - +/−
Hoffjan [61] 2005 - - - * - - NA NA -
Hussein [59] 2012 * * - * - - NA NA - +/−
Jackola [23] 2006 * - * * * - NA NA - +/−
Kabesch † [13] 2004 - * * - - - NA NA - +/−
Kormann§ [27] 2008 * * * * * - NA NA - +
Kurowski [44] 2011 - - * - - - * * -
Marcos [50] 2010 * - - * - - * - -
Miedema§ [45] 2012 - - * * - - NA NA - +/−
Moller-Larsen [28] 2008 * - * * * - NA NA - +/−
Perin [42] 2011 * - - * - - NA NA - +/−
Puthothu [57] 2006 * - * - - - NA NA - +/−
Schubert [60] 2006 * - * - - - NA NA - +/−
Sengler § [37] 2003 - * * * * - NA NA - +/−
Snijders † [52] 2006 - * * * * * * * - +
Sorensen § [47] 2009 - * * * * * * * * +
Tremblay [20] 2008 - */- * - - - NA NA - +/−
Yang [55] 2004 - - * * * * NA NA - +/−
Zhang [43] 2011 * * * * * * * * - +
  1. S1: Case definition; S2: Representativeness of the cases; S3: Selection of controls; S4: Definition of controls; C1a/C1b Comparability of cases and controls on the basis of the design or analysis; E1: Ascertainment of exposure; E2: Same method of ascertainment for cases and controls; E3: Non-response rate (*: criteria were met; -: criteria were not met); OQ: Overall quality (+: better than average quality, +/− average quality, – less than average quality); † cross-sectional study; § nested case control study; NA = not applicable.
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