Quality criteria and overall positive scores on each item
| Criteria* | Studies with positive score (%) | |
|---|---|---|
| Study attrition and follow-up duration | ||
| A | Participation rate at baseline was at least 80% | 13 |
| B | Response at first follow-up was at least 80%, or non selective non-response during first follow- up measurement was determined† | 42 |
| C | Follow-up was at least one year | 77 |
| Assessment of determinants | ||
| D | Determinants of physical activity or sedentary behaviour were measured with a reliable tool‡ | 29§ |
| E | Determinants of physical activity or sedentary behaviour were measured with a valid tool¶ | 28§ |
| Assessment of outcome measure | ||
| F | Physical activity or sedentary behaviour was measured with a reliable tool** | 23 |
| G | Physical activity or sedentary behaviour was measured with a valid tool†† | 16 |
| Data analyses | ||
| H | Results were presented as point estimates and measures of variability (SD, CI or standard error) | 45 |
| I | Statistical analyses included possible confounders | 87 |
| J | The number of cases was at least 10 times the number of independent variables | 100 |
↵* Rating of criteria: +=yes; −=no;?=unknown.
↵† + is given only if attrition analyses were performed and results showed no significant differences between dropouts and follow-up participants.
‡ + is given only if measures of determinants showed test-retest correlations of ≥0.80 or κ/ICC ≥0.70. For biological/demographic variables, a + was given only if a standardised protocol was followed, and trained researchers assessed the determinants.
↵§ Expressed as the number of cases in which the measurement of determinants were scored +, divided by the total number of determinants measured in all studies.
↵¶ + is given only if measures of determinants showed correlations of ≥0.80 or κ/ICC ≥0.70 with other similar constructs. For behavioural variables (ie, past physical activity and past sedentary behaviour), a + was given only if variables were assessed with an objective measurement instrument (ie, accelerometer/pedometer). For biological/demographic variables, a + was given only if a standardised protocol was followed, and trained researchers assessed the determinants.
↵** + is given only if physical activity or sedentary behaviour was assessed with an objective measurement instrument (accelerometer/pedometer), or questionnaire with test-retest correlations of ≥0.80 or κ/ICC ≥0.70.
↵†† + is given only if physical activity or sedentary behaviour was assessed with an objective measurement instrument (accelerometer/pedometer), or validated questionnaire with correlations of ≥0.80 or κ/ICC ≥0.70, or a combination of accelerometer/pedometer and questionnaire.