Table 2.
Descriptive statistics of composite measures
| Measure | Physical activity | Eating | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| N of items | N | Min. | Max. | M (SD) | N | N of items | Min. | Max. | M (SD) | ||
| Capability | Knowledge (score) | 6 | 582 | 0 | 6 | 4.90 (1.06) | 455 | 8 | 0 | 8 | 6.75 (1.44) |
| Perceived competence | 5 | 582 | 1 | 7 | 3.96 (1.39) | 455 | 7 | 1 | 7 | 4.99 (1.34) | |
| Decision making (pros) | 9 | 582 | 1 | 7 | 6.06 (.86) | 455 | 4 | 1 | 7 | 6.31 (.80) | |
| Decision making (cons) | 3 | 582 | 1 | 7 | 3.42 (1.43) | 455 | 5 | 1 | 7 | 3.45 (1.17) | |
| Action control | 5 | 582 | 1 | 7 | 4.28 (1.70) | 455 | 6 | 1 | 7 | 4.70 (1.30) | |
| Action planning | 4 | 582 | 1 | 7 | 4.27 (1.94) | 455 | 4 | 1 | 7 | 3.65 (1.80) | |
| Habits | 12 | 582 | 1 | 7 | 3.81 (1.56) | 455 | 11 | 1 | 7 | 4.37 (1.45) | |
| Opportunity | Subjective norms | 5 | 582 | 1 | 7 | 3.95 (1.24) | 455 | – | – | – | – |
| Subjective norms (injunctive) | – | – | – | – | – | 455 | 3 | 1 | 7 | 4.60 (1.41) | |
| Subjective norms (descriptive) | – | – | – | – | – | 455 | 3 | 1 | 7 | 4.42 (1.08) | |
| Social support | 10 | 582 | 1 | 5 | 2.49 (.40) | – | – | – | – | – | |
| Social support (positive) | – | – | – | – | – | 455 | 3 | 1 | 5 | 2.82 (1.15) | |
| Social support (negative) | – | – | – | – | – | 455 | 4 | 1 | 5 | 2.24 (1.01) | |
| Perceived environment (PA) | 5 | 582 | 1 | 5 | 3.75 (.85) | – | – | – | – | – | |
| Perceived environment (home) | – | – | – | – | – | 455 | 4 | 1 | 7 | 5.50 (1.13) | |
| Perceived environment (shop) | – | – | – | – | – | 455 | 3 | 1 | 7 | 5.57 (1.04) | |
| Perceived environment (work) | – | – | – | – | – | 455 | 3 | 1 | 7 | 4.28 (1.46) | |
| Resources (score) | 8 | 582 | 0 | 8 | 5.05 (2.04) | – | – | – | – | – | |
| Motivation | Identity | 9 | 582 | 1 | 7 | 4.15 (1.68) | 455 | 3 | 1 | 7 | 5.47 (1.12) |
| Self-efficacy | 3 | 582 | 1 | 7 | 5.06 (1.57) | 455 | 3 | 1 | 7 | 5.29 (1.26) | |
| PBC | 3 | 582 | 1 | 7 | 5.78 (1.33) | 455 | 3 | 1 | 7 | 5.99 (1.02) | |
| Attitudes (instrumental) | 3 | 582 | 1 | 7 | 6.33 (1.22) | 455 | 3 | 1 | 7 | 6.62 (.81) | |
| Attitudes (affective) | 3 | 582 | 1 | 7 | 5.34 (1.57) | 455 | 3 | 1 | 7 | 5.43 (1.33) | |
| Intentions | 3 | 582 | 1 | 7 | 4.84 (1.76) | 455 | 5 | 1 | 7 | 5.90 (.92) | |
| Goals (social) | 4 | 582 | 1 | 7 | 3.58 (1.73) | – | – | – | – | – | |
| Goals (appearance) | 3 | 582 | 1 | 7 | 5.51 (1.49) | – | – | – | – | – | |
| Goals (personal) | 4 | 582 | 1 | 7 | 5.09 (1.49) | – | – | – | – | – | |
| Goals (eating) | – | – | – | – | – | 455 | 6 | 1 | 5 | 3.37 (.95) | |
| Goals (drinking | – | – | – | – | – | 455 | 4 | 1 | 5 | 2.84 (1.09) | |
| Reinforcement | 2 | 582 | 1 | 5 | 2.71 (1.02) | 455 | – | – | – | – | |
| Reinforcement (control) | – | – | – | – | – | 455 | 4 | 1 | 7 | 4.16 (1.49) | |
| Reinforcement (mind) | – | – | – | – | – | 455 | 3 | 1 | 7 | 3.25 (1.75) | |
| Affect (positive) | 5 | 582 | 1 | 5 | 3.53 (.88) | 455 | 2 | 1 | 5 | 3.18 (1.05) | |
| Affect (negative) | 5 | 582 | 1 | 5 | 2.07 (.88) | 455 | 4 | 1 | 5 | 2.16 (.99) | |
Note. Composite measures were created as a sum of the total divided by the number of items in the measurement scale. Where required, items with low item-total correlations were removed from scales to improve reliability
Abbreviations: PBC perceived behavioural control