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BACKGROUND: The mainstay of mild to moderate acne treatment is topical antibiotics. A new combination of 2% erythromycin and 1% bifonazole was tested in a double-blind trial against erythromycin alone. METHODS: A total of 207 acne patients were recruited into the study and 157 (76%) completed the full trial protocol of 12 weeks of treatment. In all, 74 patients applied the combination solution (erythromycin + bifonazole) once a day and 83 patients applied erythromycin solution twice a day. Outcome parameters measured were lesion-count (open and closed comedones, papules and pustules) and acne grading using the Cook's acne scale, carried out at the initial visit, and at the 4, 8 and 12-week follow-up visits. RESULTS: Both treatment groups improved significantly over baseline and showed continuous improvement throughout the trial, with the erythromycin + bifonazole group showing better improvement than the erythromycin group. At the end of 12 weeks, open comedones, closed comedones, papules and pustules wer...

This study explores the effects of classroom feedback and evaluation structure on students’ attributional tendencies. It extends the application of attribution theory from its conventional use in the context of individual differences to the classroom level. A classroom model was developed describing the effects of feedback and evaluation practices on the distributional pattern of students’ attributional tendencies. The results of this study suggest that the feedback and the evaluation system in the classroom affect students’ causal explanations of their successes and failures in school. The results show’ that in classrooms where the feedback structure is rich, more specific, and individualized, the attributional tendencies of the low achievers are closer to those of the high achievers.