Table 4 Methodological quality of studies appropriate for primary care
Author, date | Type of study | Sample size | Power analysis described | How participant characteristics described | Review board approved | Randomization process described | Comparator | Blinding described | Evidence base for intervention described | Statistical analysis described |
|---|---|---|---|---|---|---|---|---|---|---|
Brar et al.,[42] | RCT | 71 | Yes | Narrative | Yes | No | Monthly weight checks and encouragement of weight loss | No | Yes; table with previous studies | Yes (paired t-tests, logistic regression, ANCOVA, Cochran-mantel-Haenszel) |
Khazaal et al.,[51] | RCT | 61 | No | Table | Yes | No | Control group with brief nutritional education | No | Yes; previous "Apple Pie" study | Yes (t-tests, Chi-square, MANOVA, MANCOVA, Fisher's exact significance tests, Cochran's Q test) |
Kwon et al.,[53] | RCT | 48 | Yes | Table | Yes | No | Routine care with verbal diet and weight management recommendations. Control group also given food and exercise diaries. | No | No | Yes (t-test and ANCOVA) |
McKibbin et al.,[56] | RCT | 64 | No | Table | Yes | No | Usual care with three health-related brochures distributed | No | Yes; previous DART study and theoretical orientation | Yes (ANOVA, t-tests, chi-square) |
Skrinar, Huxley, Hutchison, Menninger and Glew,[63] | RCT | 20 | No | Table | Yes | No | Waiting list control group | No | Yes; cites literature about role of exercise in weight management | Yes (ANOVA) |
Weber and Wyne,[65] | RCT | 17 | No (pilot study) | Table | Yes | No | Control group received treatment as usual and were weighed every four weeks. | Yes | Yes; previous Diabetes Prevention Project | Yes (t-testt-test, statistical significance set at 0.05) |