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Studies <strong>of</strong> clinical effectiveness<br />

were assessed using <strong>the</strong> following<br />

criteria, based on CRD Rep<strong>or</strong>t<br />

No. 4 23<br />

1. Was <strong>the</strong> method used to assign participants to<br />

<strong>the</strong> <strong>treatment</strong> groups really random?<br />

(Computer-generated random numbers and random<br />

number tables will be accepted as adequate;<br />

inadequate approaches will include <strong>the</strong> use <strong>of</strong><br />

alternation, case rec<strong>or</strong>d numbers, birth dates and<br />

days <strong>of</strong> <strong>the</strong> week).<br />

2. Was <strong>the</strong> allocation <strong>of</strong> <strong>treatment</strong> concealed?<br />

(Concealment will be deemed adequate where<br />

randomisation is centralised <strong>or</strong> pharmacy<br />

controlled, <strong>or</strong> where <strong>the</strong> following are used: serially<br />

numbered identical containers, on-site computerbased<br />

systems where <strong>the</strong> randomisation sequence is<br />

unreadable until after allocation, o<strong>the</strong>r approaches<br />

<strong>with</strong> robust methods to prevent f<strong>or</strong>eknowledge <strong>of</strong> <strong>the</strong><br />

allocation sequence to clinicians and patients.<br />

Inadequate approaches will include <strong>the</strong> use <strong>of</strong><br />

alternation, case rec<strong>or</strong>d numbers, days <strong>of</strong> <strong>the</strong> week,<br />

open random number lists and serially numbered<br />

envelopes even if opaque).<br />

3. Was <strong>the</strong> number <strong>of</strong> participants who were<br />

randomised stated?<br />

4. Were details <strong>of</strong> baseline comparability<br />

presented?<br />

5. Was baseline comparability achieved?<br />

6. Were <strong>the</strong> eligibility criteria f<strong>or</strong> study entry<br />

specified?<br />

7. Were any co-interventions identified that may<br />

influence <strong>the</strong> outcomes f<strong>or</strong> each group?<br />

8. Were <strong>the</strong> outcome assess<strong>or</strong>s blinded to <strong>the</strong><br />

<strong>treatment</strong> allocation?<br />

9. Were <strong>the</strong> individuals who administered <strong>the</strong><br />

intervention blinded to <strong>the</strong> <strong>treatment</strong><br />

allocation?<br />

10. Were <strong>the</strong> participants who received <strong>the</strong><br />

intervention blinded to <strong>the</strong> <strong>treatment</strong><br />

allocation?<br />

11. Was <strong>the</strong> success <strong>of</strong> <strong>the</strong> blinding procedure<br />

assessed?<br />

12. Were at least 80% <strong>of</strong> <strong>the</strong> participants<br />

<strong>or</strong>iginally included in <strong>the</strong> randomisation<br />

process followed up in <strong>the</strong> final analysis?<br />

13. Were <strong>the</strong> reasons f<strong>or</strong> <strong>with</strong>drawals stated?<br />

14. Was an intention-to-treat analysis included?<br />

Appendix 4<br />

Quality assessment strategy<br />

© Queen’s Printer and Controller <strong>of</strong> HMSO 2007. All rights reserved.<br />

Health Technology Assessment 2007; Vol. 11: No. 2<br />

Items were graded in terms <strong>of</strong> yes (item<br />

properly addressed), no (item not properly<br />

addressed), partially (item partially addressed),<br />

unclear <strong>or</strong> not enough inf<strong>or</strong>mation, <strong>or</strong> not<br />

applicable.<br />

Studies <strong>of</strong> cost-effectiveness were<br />

assessed using <strong>the</strong> following<br />

criteria, which is an updated<br />

version <strong>of</strong> <strong>the</strong> checklist developed<br />

by Drummond and colleagues 24<br />

Study question<br />

1. Costs and effects examined.<br />

2. Alternatives compared.<br />

3. The viewpoint(s)/perspective <strong>of</strong> <strong>the</strong> analysis is<br />

clearly stated (e.g. NHS, society).<br />

Selection <strong>of</strong> alternatives<br />

4. All relevant alternatives are compared<br />

(including do nothing if applicable).<br />

5. The alternatives being compared are clearly<br />

described (who did what, to whom, where and how<br />

<strong>of</strong>ten).<br />

6. The rationale f<strong>or</strong> choosing <strong>the</strong> alternative<br />

programmes <strong>or</strong> interventions compared is<br />

stated.<br />

F<strong>or</strong>m <strong>of</strong> evaluation<br />

7. The choice <strong>of</strong> f<strong>or</strong>m <strong>of</strong> economic evaluation is<br />

justified in relation to <strong>the</strong> questions<br />

addressed.<br />

8. If a cost-minimisation design is chosen, have<br />

equivalent outcomes been adequately<br />

demonstrated?<br />

Effectiveness data<br />

9. The source(s) <strong>of</strong> effectiveness estimates used<br />

are stated (e.g. single study, selection <strong>of</strong> studies,<br />

systematic review, expert opinion).<br />

10. Effectiveness data from RCT <strong>or</strong> review <strong>of</strong><br />

RCTs.<br />

11. Potential biases identified (especially if data<br />

not from RCTs).<br />

12. Details <strong>of</strong> <strong>the</strong> method <strong>of</strong> syn<strong>the</strong>sis <strong>or</strong> metaanalysis<br />

<strong>of</strong> estimates are given (if based on<br />

an overview <strong>of</strong> a number <strong>of</strong> effectiveness<br />

studies).<br />

119

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