Table 2

Baseline scores and values for components of the Theory of Planned Behaviour for dropouts and stayers

Time point and participant typeType of groupAttitudesSubjective normsPerceived behavioural control (PBC)Actual behavioural control
Attitudes (Calories)Attitudes (Fat)Attitudes (Protein)Friends eat a healthy dietFamily eats a healthy dietPBC (Calories)PBC (Fat)PBC (Protein)Stage of changeIncome ($C)Level of education
3-month stayersGLB6.39±0.756.27±0.946.30±0.734.06±1.695.06±1.644.45±1.284.73±1.384.76±1.393.70±1.05 70,619±37 561* 3.97±0.73
GLB+NGx6.49±0.986.23±1.036.31±1.054.57±1.315.06±1.324.31±1.604.37±1.654.80±1.574.00±1.06 85,059±44 460* 4.06±0.79
3-month dropoutsGLB6.16±0.995.89±1.505.76±1.284.19±1.654.65±1.584.25±1.464.31±1.604.56±1.483.42±1.00 76,806±44 778* 3.75±0.84
GLB+NGx6.24±1.106.26±0.936.29±0.914.18±1.315.00±1.304.50±1.644.71±1.515.35±1.593.67±0.88 56,865±39 852* 3.97±0.76
6-month stayersGLB6.50±0.676.22±0.976.31±0.784.31±1.605.06±1.614.28±1.284.63±1.434.78±1.393.59±1.0468,006±33 4323.97±0.65
GLB+NGx6.51±0.956.31±1.006.41±0.984.48±1.305.00±1.394.38±1.684.41±1.574.54±1.483.93±1.1074,893±45 0094.04±0.96
6-month dropoutsGLB6.01±1.005.95±1.495.76±1.243.97±1.724.66±1.624.41±1.464.52±1.705.21±1.663.51±1.0279,056±47 0793.76±0.89
GLB+NGx6.36±1.046.24±0.986.23±0.974.30±1.345.05±1.264.43±1.584.55±1.504.98±1.563.78±0.8968,808±44 1974.00±0.82
12-month stayersGLB6.57±0.606.43±0.876.29±0.854.43±1.665.24±1.444.38±1.364.57±1.604.81±1.503.67±1.1168,760±31 1954.05±0.67
GLB+NGx6.39±1.106.21±1.076.18±1.124.53±1.355.07±1.394.57±1.734.68±1.765.18±1.704.04±1.1081,574±42 4114.00±0.92
12-month dropoutsGLB6.14±0.965.92±1.405.90±1.164.00±1.664.67±1.664.33±1.394.48±1.474.58±1.413.50±0.9976,149±45 1773.77±0.83
GLB+NGx6.34±1.026.27±0.926.39±0.864.27±1.305.00±1.264.29±1.544.44±1.455.00±1.533.71±0.8764,338±44 7404.02±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 .