Purpose: To investigate the correlation among different investigators (intrarater variation) in the assessment of acne vulgaris severity using Acne Grading System (AGS), International Improvement Grading System (IIGS), Investigator Global Assessment of acne (IGA), and Global Evaluation Acne (GEA), and to compare AGS and IIGS with the IGA recommended in the United States, and GEA in Europe. Methods:A prospective cross-sectional study was conducted among patients with acne vulgaris, attending the dermatology outpatient clinics at five hospitals in China.Four investigators were engaged using AGS, IIGS, IGA, and GEA to assess severity of acne vulgaris. Correlation among AGS, IIGS, GEA, and IGA were analyzed.Results: A total of 1107 participants suffering from acne vulgaris were enrolled. There was evidence of adequate internal consistency among AGS, IIGS, IGA, and GEA. For the intrarater reliability, AGS, IIGS, GEA, and IGA demonstrated excellent reliability.Moreover, AGS, IIGS, IGA, and GEA were significantly correlated with each other (p ≤ 0.01). Conclusion:IIGS and AGS were reliable, and correlated well with IGA and GEA.

Background: The prevalence of skin diseases and diabetes mellitus (DM) are prominent around the world. The current scope of knowledge regarding the prevalence of skin diseases and comorbidities with type 2 DM (T2DM) is limited, leading to limited recognition of the correlations between skin diseases and T2DM. Methods: We collected 383 subjects from the Da Qing Diabetes Study during the period from July 9th to September 1st, 2016. The subjects were categorized into three groups: Normal glucose tolerance (NGT), impaired glucose tolerance (IGT), and T2DM. The prevalence and clinical characteristics of skin diseases were recorded and investigated. Results: In this cross-sectional study, 383 individuals with ages ranging from 53 to 89-year-old were recruited. The overall prevalence of skin diseases was 93.5%, and 75.7% of individuals had two or more kinds of skin diseases. Additionally, there were 47 kinds of comorbid skin diseases in patients with T2DM, of which eight kinds of skin diseases had a prevalence >10%. The prevalence of skin diseases in NGT, IGT, and T2DM groups were 93.3%, 91.5%, and 96.6%, respectively; stratified analysis by categories showed a statistically significant difference in “disturbances of pigmentation” and “neurological and psychogenic dermatoses”. The duration of T2DM also significantly associated with the prevalence of “disturbances of pigmentation” and “neurological and psychogenic dermatoses”. Subsequently, the prevalence of “disturbances of pigmentation” was higher in males than females in NGT ( P < 0.01) and T2DM ( P < 0.01) groups. In addition, the difference in the prevalence of “disturbances of pigmentation” was also significant in NGT and T2DM groups ( P < 0.01). Conclusions: There was a high prevalence of skin diseases in the Da Qing Diabetes Study. To address the skin diseases in the Da Qing Diabetes Study, increased awareness and intervention measures should be implemented.