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Table 4

From: Post-trial follow-up methodology in large randomized controlled trials: a systematic review protocol

Step

Search terms

1

MeSH descriptor: [Surveys and Questionnaires] this term only

2

MeSH descriptor: [Data Collection] this term only

3

MeSH descriptor: [Interview] explode all trees

4

MeSH descriptor: [Automatic Data Processing] this term only

5

data collection or “data processing*” or “data system*” or “data linkage” or “data reporting” or incidence or mortality or “health episode statistics” or “electronic health record*” or “electronic patient record*” or “record linkage system” or “record-linkage system*” or “national registr*” or “national database” or “episode of care” or “routine data” or “routinely collected data”:ti,ab,kw (Word variations have been searched)

6

1 or 2 or 3 or 4 or 5

7

cost effective* or “cost benefit*” or costs or “clinical effectiveness” or survivors or “hospital admission*” or hospitalisation* or hospitalization* or “primary outcome*” or “secondary outcome*” or “outcome measure*” or “outcome assessment” or “outcomes research” or “treatment outcome”:ti,ab,kw (Word variations have been searched)

8

post trial or posttrial or attrition or “drop out*” or dropout* or “follow up” or followup* or extension or “trial closure*” or “long term” or longterm or “extended observation*”:ti,ab,kw (Word variations have been searched)

9

6 and 7 and 8