Overview of three models: one model including all generic biological/lifestyle factors, one model containing all psychological factors and one model containing all social factors
| Associated factors | Unstandardised β | Effect size | 95% CI |
| Model 1. Biological/lifestyle factors (N=413, adj. R2 58.4%) | |||
| Factors associated with more fatigue | |||
| Pain (VAS, range 0–10) | −1.1 | −0.1 | −1.7 to −0.5** |
| Difficulties getting to sleep (0–5; ‘never’ to ‘almost every day’) | −3.3 | −0.2 | −4.3 to −2.4** |
| Factors associated with less fatigue | |||
| No of days physically active/week (0–7) | 0.4 | 0.0 | −0.3 to 1.1 |
| Physical functioning (PedsQL GCS subscale, range 0–100) | 0.6 | 0.5 | 0.5 to 0.7** |
| Model 2. Psychological factors (n=370, adj. R2 65.8%) | |||
| Factors associated with more fatigue | |||
| Depressive symptoms (RCADS, range 0–30) | −3.5 | −0.7 | −4.0 to −3.0** |
| Anxiety level (RCADS, range 0–111) | 0.3 | 0.2 | 0.1 to 0.4** |
| Pain catastrophising (PCS-C, range 0–52) | −0.3 | 0.1 | −0.5 to −0.1** |
| Factors associated with less fatigue | |||
| Emotional functioning (PedsQL GCS, range 0–100) | 0.2 | 0.2 | 0.1 to 0.3** |
| Model 3. Social factors (n=413, adj. R2 50.0%) | |||
| Factors associated with more fatigue | |||
| Pressure at school (0–4; ‘not at all’ to ‘a lot’) | −5.5 | −0.2 | −7.4 to −3.5** |
| Being bullied (0–5; never to several times per week) | 4.7 | 0.1 | 1.9 to 7.5** |
| Factors associated with less fatigue | |||
| Communication at home (1–5, higher score=better communication) | −1.2 | −0.0 | −4.3 to 1.9 |
| Support at home (1–7, higher score=more support) | 1.6 | 0.1 | −0.5 to 3.7 |
| Support by friends (1–7, higher score=more support) | 0.2 | 0.0 | −1.2 to 1.6 |
| Social functioning (PedsQL GCS subscale, range 0–100) | 0.8 | 0.6 | 0.7 to 1.0** |
| Member of a sports team or club (0=not a member, 1=member) | 1.8 | 0.0 | −1.6 to 5.3 |
| Factors not associated with fatigue in this sample | |||
| Screen time per day (hours/day) | −0.9 | −0.1 | −2.1 to 0.3 |
In all models, fatigue is the dependent variable. Models are adjusted for age and sex of the child. The PedsQL MFS is scored on a scale from 0 to 100, with a lower score indicating more severe fatigue. Thus, a negative correlation indicates a lower score, thus indicating more fatigue.
*P<0.05, **p<0.01.
PCS-C, Pain Catastrophising Scale for Children; PedsQL GCS, PedsQL Generic Core Scale; PedsQL MFS, PedsQL Multidimensional Fatigue Scale; RCADS, Revised Child Anxiety and Depression Scale; VAS, Visual Analogue Scale.