Baseline scores and values for components of the Theory of Planned Behaviour for dropouts and stayers
| Time point and participant type | Type of group | Attitudes | Subjective norms | Perceived behavioural control (PBC) | Actual behavioural control | |||||||
| Attitudes (Calories) | Attitudes (Fat) | Attitudes (Protein) | Friends eat a healthy diet | Family eats a healthy diet | PBC (Calories) | PBC (Fat) | PBC (Protein) | Stage of change | Income ($C) | Level of education | ||
| 3-month stayers | GLB | 6.39±0.75 | 6.27±0.94 | 6.30±0.73 | 4.06±1.69 | 5.06±1.64 | 4.45±1.28 | 4.73±1.38 | 4.76±1.39 | 3.70±1.05 | 70,619±37 561* | 3.97±0.73 |
| GLB+NGx | 6.49±0.98 | 6.23±1.03 | 6.31±1.05 | 4.57±1.31 | 5.06±1.32 | 4.31±1.60 | 4.37±1.65 | 4.80±1.57 | 4.00±1.06 | 85,059±44 460* | 4.06±0.79 | |
| 3-month dropouts | GLB | 6.16±0.99 | 5.89±1.50 | 5.76±1.28 | 4.19±1.65 | 4.65±1.58 | 4.25±1.46 | 4.31±1.60 | 4.56±1.48 | 3.42±1.00 | 76,806±44 778* | 3.75±0.84 |
| GLB+NGx | 6.24±1.10 | 6.26±0.93 | 6.29±0.91 | 4.18±1.31 | 5.00±1.30 | 4.50±1.64 | 4.71±1.51 | 5.35±1.59 | 3.67±0.88 | 56,865±39 852* | 3.97±0.76 | |
| 6-month stayers | GLB | 6.50±0.67 | 6.22±0.97 | 6.31±0.78 | 4.31±1.60 | 5.06±1.61 | 4.28±1.28 | 4.63±1.43 | 4.78±1.39 | 3.59±1.04 | 68,006±33 432 | 3.97±0.65 |
| GLB+NGx | 6.51±0.95 | 6.31±1.00 | 6.41±0.98 | 4.48±1.30 | 5.00±1.39 | 4.38±1.68 | 4.41±1.57 | 4.54±1.48 | 3.93±1.10 | 74,893±45 009 | 4.04±0.96 | |
| 6-month dropouts | GLB | 6.01±1.00 | 5.95±1.49 | 5.76±1.24 | 3.97±1.72 | 4.66±1.62 | 4.41±1.46 | 4.52±1.70 | 5.21±1.66 | 3.51±1.02 | 79,056±47 079 | 3.76±0.89 |
| GLB+NGx | 6.36±1.04 | 6.24±0.98 | 6.23±0.97 | 4.30±1.34 | 5.05±1.26 | 4.43±1.58 | 4.55±1.50 | 4.98±1.56 | 3.78±0.89 | 68,808±44 197 | 4.00±0.82 | |
| 12-month stayers | GLB | 6.57±0.60 | 6.43±0.87 | 6.29±0.85 | 4.43±1.66 | 5.24±1.44 | 4.38±1.36 | 4.57±1.60 | 4.81±1.50 | 3.67±1.11 | 68,760±31 195 | 4.05±0.67 |
| GLB+NGx | 6.39±1.10 | 6.21±1.07 | 6.18±1.12 | 4.53±1.35 | 5.07±1.39 | 4.57±1.73 | 4.68±1.76 | 5.18±1.70 | 4.04±1.10 | 81,574±42 411 | 4.00±0.92 | |
| 12-month dropouts | GLB | 6.14±0.96 | 5.92±1.40 | 5.90±1.16 | 4.00±1.66 | 4.67±1.66 | 4.33±1.39 | 4.48±1.47 | 4.58±1.41 | 3.50±0.99 | 76,149±45 177 | 3.77±0.83 |
| GLB+NGx | 6.34±1.02 | 6.27±0.92 | 6.39±0.86 | 4.27±1.30 | 5.00±1.26 | 4.29±1.54 | 4.44±1.45 | 5.00±1.53 | 3.71±0.87 | 64,338±44 740 | 4.02±0.85 | |
Mean scores for attitudes, subjective norms and PBC (calories, fat, protein) on a Likert scale of 1 (negative attitude/subjective norms/PBC) to 7 (positive attitude/subjective norms/PBC); mean scores for stage of change on Likert scale of 1 to 6 (pre-contemplation, contemplation, motivation, action of <3 months, action of 3–6 months, maintenance of >6 months); mean scores for highest level of education on a Likert scale of 1 to 5 (elementary school, middle school, high school, college, university); ‘stayers’ were defined as individuals completing baseline and 3/6/12 month food records.
* P-interaction<0.05.
GLB, Group Lifestyle Balance; NGx, nutrigenomics .