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Table 6 Results of factor analysis (principal components with varimax rotation)

From: Reliability and validity of the AGREE instrument used by physical therapists in assessment of clinical practice guidelines

  Item Mean Std. Deviation Components
    1 2 3 4
Scope and Purpose
Q1 3.4003 .72614 .690 .339 .271 .217
Q2 2.9681 .68948 .803 .213 .129 .296
Q3 3.3961 .51941 .393 .489 .016 .430
Stakeholder Involvement
Q4 2.6814 1.07262 .336 .422 .661 .093
Q5 1.7517 .89553 .179 .173 .739 .058
Q6 2.8331 .89717 .195 .294 .726 .259
Q7 1.6664 .75710 .255 .290 .675 .175
Rigour of development
Q8 2.7344 1.21287 .902 .096 .247 -.087
Q9 2.6533 1.20139 .913 .112 .229 -.123
Q10 2.6314 1.05247 .800 .132 .384 .066
Q11 2.9492 .76769 .059 .339 .302 .682
Q12 2.9811 1.00409 .626 -.058 .223 .514
Q13 2.3556 1.16306 .422 .273 .617 .213
Q14 1.9425 .99370 .323 .668 .090 .044
Clarity and presentation
Q15 3.2250 .73262 .132 .200 .149 .864
Q16 3.2269 .77070 .022 .607 .241 .322
Q17 3.1631 .71880 .093 .606 .453 .400
Q18 2.3342 .98180 .091 .671 .449 .273
Applicability
Q19 2.2072 .94797 .158 .830 .231 .005
Q20 1.9500 .83211 .172 .818 .176 -.073
Q21 2.2336 .80322 -.017 .775 .299 .237
Editorial Independence
Q22 2.1453 .90158 .451 .108 .669 .045
Q23 1.7575 .92802 .178 .305 .452 -.436
  1. This table presents the results of the final 4 factor solution to factor analysis. Bolded cells shown the factor for which each item loaded most strongly. Results are grouped according to the Domains of the AGREE.