Table 3 Principal component analysis: does each scale measure a different dimension?
A. Factorial construct validity | n = 338 | ||||
|---|---|---|---|---|---|
Factor loading after varimax rotation | Principal component | Principal component | Principal component | Principal component | Principal component |
| Â | 1 | 2 | 3 | 4 | 5 |
A-3 Do you follow the meal plans specified by the physician or dietitian? | 0.822 | 0.098 | 0.084 | 0.135 | -0.007 |
A-4 Do you observe balanced food intake in your three meals? | 0.828 | 0.200 | -0.000 | 0.105 | -0.002 |
A-5 Do you stick to the amounts specified for staple foods? | 0.811 | 0.049 | -0.011 | 0.010 | -0.130 |
A-7 Do you eat vegetables at all three meals? | 0.508 | 0.261 | -0.164 | 0.022 | -0.037 |
A-8 Do you exercise more than 20Â minutes a day? | 0.164 | 0.912 | -0.050 | 0.072 | -0.039 |
A-9 Do you remember to exercise even if busy at work or home? | 0.189 | 0.903 | 0.004 | 0.133 | -0.057 |
A-10 Do you come up with different ways to exercise when the weather is bad? | 0.174 | 0.799 | -0.034 | 0.165 | -0.096 |
B-1 How upsetting is having diabetes for you? | -0.128 | 0.053 | 0.740 | 0.031 | 0.152 |
B-3 How much uncertainty do you currently experience in your life as a result of being diabetic? | 0.068 | 0.058 | 0.801 | 0.007 | 0.116 |
B-4 How likely is your diabetes to worsen over the next several years? (Try to give an estimate based on your personal feeling rather than based on a rational judgment.) | -0.177 | -0.150 | 0.715 | -0.052 | -0.071 |
B-7 To what degree does your diabetes get in the way of your developing life goal? | 0.160 | -0.065 | 0.771 | 0.054 | -0.022 |
D-4 Criticize you for not exercising regularly? | 0.025 | -0.099 | -0.014 | 0.135 | 0.788 |
D-6 Nag you about not following your diet? | -0.064 | -0.077 | 0.104 | 0.205 | 0.799 |
D-7 Argue with you about your diabetes self-care activities? | -0.124 | -0.014 | 0.093 | 0.141 | 0.749 |
D-1 Praise you for following your diet? | 0.058 | 0.033 | 0.025 | 0.781 | 0.047 |
D-3 Suggest things that might help you take insulin on time? | -0.013 | 0.064 | -0.074 | 0.569 | 0.310 |
D-9 Plan family activities so that they will fit in with your diabetes self-care schedule? | 0.191 | 0.164 | 0.067 | 0.650 | 0.035 |
D-10 Congratulate you for sticking to your diabetes self-care schedule? | 0.023 | 0.111 | 0.012 | 0.761 | 0.247 |
B. Correlation within the five scales? | n = 338 | ||||
Pearson’s correlation coefficients | Self-managed dietary behaviors | Self-managed exercise behaviors | Psychological impact of diabetes | Patient-family communication: | |
| Â | Â | Â | Â | Positive feedback | Negative feedback |
A-3 Do you follow the meal plans specified by the physician or dietitian? | 0.643 | 0.290 | 0.042 | 0.197 | -0.037 |
A-4 Do you observe balanced food intake in your three meals? | 0.701 | 0.356 | -0.024 | 0.194 | -0.066 |
A-5 Do you stick to the amounts specified for staple foods? | 0.619 | 0.237 | -0.042 | 0.066 | -0.158 |
A-7 Do you eat vegetables at all three meals? | 0.390 | 0.297 | -0.133 | 0.109 | -0.113 |
A-8 Do you exercise more than 20Â minutes a day? | 0.329 | 0.829 | -0.085 | 0.194 | -0.109 |
A-9 Do you remember to exercise even if busy at work or home? | 0.361 | 0.846 | -0.038 | 0.245 | -0.108 |
A-10 Do you come up with different ways to exercise when the weather is bad? | 0.330 | 0.691 | -0.070 | 0.238 | -0.118 |
B-1 How upsetting is having diabetes for you? | -0.104 | -0.041 | 0.555 | 0.079 | 0.166 |
B-3 How much uncertainty do you currently experience in your life as a result of being diabetic? | 0.049 | 0.009 | 0.617 | 0.068 | 0.132 |
B-4 How likely is your diabetes to worsen over the next several years? (Try to give an estimate based on your personal feeling rather than based on a rational judgment.) | -0.178 | -0.169 | 0.502 | -0.092 | 0.040 |
B-7 To what degree does your diabetes get in the way of your developing life goal? | 0.102 | -0.021 | 0.553 | 0.048 | 0.065 |
D-4 Criticize you for not exercising regularly? | -0.049 | -0.110 | 0.053 | 0.300 | 0.529 |
D-6 Nag you about not following your diet? | -0.106 | -0.110 | 0.148 | 0.344 | 0.629 |
D-7 Argue with you about your diabetes self-care activities? | -0.142 | -0.075 | 0.122 | 0.280 | 0.553 |
D-1Praise you for following your diet? | 0.138 | 0.159 | 0.033 | 0.499 | 0.233 |
D-3 Suggest things that might help you take insulin on time? | 0.047 | 0.113 | -0.014 | 0.412 | 0.330 |
D-9 Plan family activities so that they will fit in with your diabetes self-care schedule? | 0.241 | 0.265 | 0.049 | 0.425 | 0.175 |
D-10 Congratulate you for sticking to your diabetes self-care schedule? | 0.109 | 0.188 | 0.036 | 0.588 | 0.358 |