Table 2.

Themes adapted from the theoretical framework with sub-themes from data analysis.

Themes	Sub-themes
1. Approach to trying out the app: affective attitude and ethicality	1.1. The impact of living with pain 1.2. Current management options
2. Perceived effectiveness	2.1. Extent of pain relief 2.2. Additional reported effects
3. Opportunity costs and burden	3.1. Fitting app use into everyday life 3.2. Negative effects of app use
4. Intervention coherence and self-efficacy	4.1. Understandings of and familiarity with technology 4.2. Intervention usability and suggestions for development