Characteristics of included trials evaluating new questionnaire strategies
| Trial | Number randomised | Disease/condition | Participants | Setting | Intervention(s) | Control | Outcome retention trial | Time point used in analysis |
|---|---|---|---|---|---|---|---|---|
| Short vs long questionnaire | ||||||||
| Dorman 1997 | 2253 | Treatment of stroke | Patients with stroke | UK hospital | Short EUROQOL questionnaire | Long SF 36 questionnaire | Postal questionnaire response after first mail out and reminder | Response at first time point |
| Edwards 2001 unpublished | 99 | Treatment of head injury | Head injury patients | UK hospital intensive care units | 1-page, 7 question functional dependence questionnaire | 3-page, 16 question functional dependence questionnaire. | Postal questionnaire response | Response at 3 months |
| Svoboda 2001 unpublished | 91 | Treatment of head injury | Head injury patients | Czech republic hospital intensive care units | 1-page, 7 question functional dependence questionnaire | 3-page, 16 question functional dependence questionnaire. | Postal questionnaire response | Response at 3 months |
| McCambridge 2011 1b | 2835 | Treatment of alcohol dependence | Adults scoring +5 on Audit C | Community web based | Audit Short (alcohol use disorders questionnaire) + LDQ (Leeds dependancy questionnaire) | APQ (alcohol problems questionnaire) | Web-based questionnaire response at 1 month and 3 months | Response at 1 month |
| McCambridge 2011 2b | 1999 | Treatment of alcohol dependence | Adults scoring +5 on Audit C | Community web based | Audit Short (alcohol use disorders questionnaire) + LDQ (Leeds dependancy questionnaire) | APQ (alcohol problems questionnaire) | Web-based questionnaire response at 3 month and 12 months | Response at 3 months |
| Long and clear vs short and condensed questionnaires | ||||||||
| Subar 2001 | 900 | Screening prostate, lung, ovarian, colorectal cancer | Adults in PLCO trial | US sites | DHQ (36-page food frequency questionnaire) | PLCO (16-page food frequency questionnaire) | Postal questionnaire/response on site completion | Overall response |
| Question order: condition first vs generic first questions | ||||||||
| McColl 2003 (1) | 4751 | Clinical management of asthma | Adults with asthma | UK primary care | Condition-specific questions first followed by generic | Generic questions followed by condition specific | Postal questionnaire response | Overall response |
| McColl 2003 (2) | 4684 | Clinical management of angina | Adults with angina | UK primary care | Condition-specific questions followed by generic | Generic questions followed by condition specific | Postal questionnaire response | Overall response |
| Letley unpublished. No data available | Data not available | Treatment of back pain | Adults with low back pain | UK primary care | 23-page self-completion Roland disability questionnaire at front and SF 36 at back | vice versa | Questionnaire response | No data |
| Questionnaire: relevant vs less relevant to condition | ||||||||
| McCambridge 2011 1a | 1892 | Treatment of alcohol dependence | Adults scoring +5 on Audit C | Community web based | Alcohol problem questionnaire (APQ)23 items | Core OM Mental health assessment 23/34 items | Web-based questionnaire response at 1 and 3 months | Response at 1 month |
| McCambridge 2011 2a | 2001 | Treatment of alcohol dependence | Adults scoring +5 on Audit C | Community web based | Audit Short (alcohol use disorders questionnaire) + LDQ (Leeds dependancy questionnaire) | Core OM Mental health assessment 10 items | Web-based questionnaire response at 3 and 12 months | Response at 3 months |