Outcome
Type |
Measure |
Description |
Time frame |
Safety issue |
Other |
Baseline scores on the Credibility/Expectancy of Change Questionnaire will moderate the primary and secondary outcomes. |
This questionnaire measures how much people believe the therapy will help improve lifestyle and functioning prior to the start of the therapy, producing a score between 0 and 21, with higher scores indicating greater treatment credibility and expectancy for change. |
Baseline (week 0) |
|
Other |
Baseline scores on the Attitudes Towards Hypnosis scale will moderate the primary and secondary outcomes specified above. |
This scale measures how much people believe hypnosis can be helpful, producing a score between 13 and 91, with higher scores indicating greater belief in the efficacy of hypnosis. |
Baseline (week 0) |
|
Other |
Week 2 scores of a bespoke measure of hypnotic suggestibility will predict the degree of change in the primary and secondary outcomes specified above [this applies to the intervention group only]. |
This bespoke measure will be administered in the online, group-based hypnosis session and will measure intervention participants' suggestibility, producing a score from 0 to 50, with higher scores indicating greater suggestibility. |
Within the online, group-based intervention session (week 2). |
|
Primary |
Change from baseline at 7-8 weeks in mean headache rating averaged over 2 weeks of headache diary entries. |
At baseline (weeks 0-1) and post-intervention (weeks 7-8), participants will complete a headache diary for two weeks. The diary comprises hourly ratings of headache intensity (during waking hours) on a 0-5 scale, with higher scores indicating greater migraine/tension-type headache symptom burden. The mean rating over two weeks is used. |
Post intervention (weeks 7-8) |
|
Secondary |
Change from baseline at 11-12 weeks in mean headache rating averaged over 2 weeks of headache diary entries. |
As described in the primary outcome. |
Follow-up (weeks 11-12) |
|
Secondary |
Change from baseline at 7-8 weeks in headache frequency over 2 weeks of headache diary entries. |
Using the aforementioned headache diary, the frequency of headaches over the 2 week diary period will be calculated. |
Post intervention (weeks 7-8) |
|
Secondary |
Change from baseline at 11-12 weeks in headache frequency over 2 weeks of headache diary entries. |
Using the aforementioned headache diary, the frequency of headaches over the 2 week diary period will be calculated. |
Follow-up (weeks 11-12) |
|
Secondary |
Change from baseline at 7-8 weeks in mean headache duration over 2 weeks of headache diary entries. |
Using the aforementioned headache diary, the mean duration of headaches over the 2 week diary period will be calculated. |
Post intervention (weeks 7-8) |
|
Secondary |
Change from baseline at 11-12 weeks in mean headache duration over 2 weeks of headache diary entries. |
Using the aforementioned headache diary, the mean duration of headaches over the 2 week diary period will be calculated. |
Follow-up (weeks 11-12) |
|
Secondary |
Change from baseline at week 7 on the Depression, Anxiety and Stress Scales - 21 item version (DASS-21) |
This measures symptoms of depression, anxiety and stress producing a score between 0 and 63, with higher scores indicating greater symptomatology. |
Post intervention (week 7) |
|
Secondary |
Change from baseline at week 11 on the Depression, Anxiety and Stress Scales - 21 item version (DASS-21) |
This measures symptoms of depression, anxiety and stress producing a score between 0 and 63, with higher scores indicating greater symptomatology. |
Follow-up (week 11) |
|
Secondary |
Change from baseline at week 7 on the Warwick-Edinburgh Mental Wellbeing (WEMWBS) Scale |
This measures psychological wellbeing, producing a score between 15 and 75, with higher scores indicating greater wellbeing. |
Post intervention (week 7) |
|
Secondary |
Change from baseline at week 11 on the Warwick-Edinburgh Mental Wellbeing (WEMWBS) Scale |
This measures psychological wellbeing, producing a score between 15 and 75, with higher scores indicating greater wellbeing. |
Follow-up (week 11) |
|
Secondary |
Change from baseline at week 7 on the Headache-Specific Locus of Control Scale (HSLC). |
This measures one's sense of locus of control over headaches, producing a score between 33 and 165, with higher scores indicating more external perceived locus of control. |
Post intervention (week 7) |
|
Secondary |
Change from baseline at week 11 on the Headache-Specific Locus of Control Scale (HSLC). |
This measures one's sense of locus of control over headaches, producing a score between 33 and 165, with higher scores indicating more external perceived locus of control. |
Follow-up (week 11) |
|
Secondary |
Change from baseline at week 7 on the Headache Management Self-efficacy Scale (HMSE). |
This measures headache management self-efficacy, producing a score between 25 and 175, with higher scores indicating greater perceived self-efficacy over headache self-management. |
Post intervention (week 7) |
|
Secondary |
Change from baseline at week 11 on the Headache Management Self-efficacy Scale (HMSE). |
This measures headache management self-efficacy, producing a score between 25 and 175, with higher scores indicating greater perceived self-efficacy over headache self-management. |
Follow-up (week 11) |
|
Secondary |
Change from baseline at 7-8 weeks in headache related medication consumption over a two week period. |
At baseline (weeks 0-1) and post-intervention (weeks 7-8), participants will keep a diary of their daily, headache-related medication consumption over a two week period. From this, changes in type, dose and frequency of medication will be calculated. |
Post intervention (weeks 7-8) |
|
Secondary |
Change from baseline at 11-12 weeks in headache related medication consumption over a two week period. |
At baseline (weeks 0-1) and follow-up (weeks 11-12), participants will keep a diary of their daily, headache-related medication consumption over a two week period. From this, changes in type, dose and frequency of medication will be calculated. |
Follow-up (weeks 11-12) |
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