Table 4

Outcomes assessment tools psychometric value

VariableStudyMeasurement toolsPsychometrics (obtained directly from original studies or from references included in the original studies)
Fatigue9Homemade questionnaireReliability: 0.58–0.79 (Pearson product moment correlations)
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
4Fatigue Assessment ScaleReliability: 0.9 (Cronbach’s α)
Validity: 0.61–0.78 (Pearson correlation with other scales)
Responsiveness: N/A
MCID: N/A
Other: N/A
Sleep quality4,7Pittsburgh Sleep Quality Index (PSQI)Reliability: 0.85 (Test–retest correlation) & 0.83 (Cronbach’s α)
Validity: 89.6% sensitivity & 86.5% specificity
Responsiveness: N/A
MCID: N/A
Other: N/A
8,12Homemade questionnaireReliability: N/A
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
BMI2,6,71 012Homemade questionnaire asking for weight and heightReliability: 0.52–0.92 (Cronbach’s α)
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
Musculoskeletal pain5Survey of Adolescent Life in VästmanlandReliability: 0.68 (Cronbach’s α)
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
11Homemade questionnaireReliability: N/A, but the authors ran a pre-test with 131 adolescents to assure the consistency and the clarity.
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
3Homemade questionnaireReliability: N/A
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
Dietary behaviours1Ad libitum test mealReliability: R2=0.742, p<0.0001 (2-day test–retest correlation)
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
1Indirect calorimetryReliability: N/A
Validity: 1.5% variability (weekly validation with the alcohol burning test)
Responsiveness: N/A
MCID: N/A
Other: N/A
7Food frequency questionnaire (EPIC-FFQ)Reliability: 0.8 (female) and 0.9 (male)
Reproducibility at 6 months ranged from
Validity: 0.77(male)–0.62(female)Pearson correlation coefficients with 24- hour dietary recall.
Responsiveness: N/A
MCID: N/A
Other: N/A
12Homemade questionnaireReliability: N/A
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
General health/health status9Homemade questionnaireReliability: 0.58–0.79 (Pearson product moment correlations)
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
8,12Homemade questionnaireReliability: N/A
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
10Behavioural Risk Factor Surveillance SystemReliability: 0.7–0.8 (Cronbach’s α)
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
Physical activity and sedentary behaviours7International Physical Activity Questionnaire (IPAQ, long-version)Reliability: 0.8 (test–retest Spearman correlation coefficients)
Validity: 0.33, 95% CI 0.26 to 0.39 (Spearman’s coefficients)
Responsiveness: N/A
MCID: N/A
Other: N/A
3,12Homemade questionnaireReliability: N/A
Validity: N/A
Responsiveness: N/A
MCID: N/A
Other: N/A
  • BMI, body mass index; MCID, minimal clinically important change score; N/A, not available in the study.