Ayhan Demir | PubMed Health

PubMed2003

The role of peers and families in predicting the loneliness level of adolescents.

The authors investigated the relative contribution of peer relations, family structure, and demographic variables in predicting loneliness in adolescents. Ninth-grade high school students (N = 756) from 8 different schools representing various socioeconomic status in Ankara, Turkey, completed the UCLA Loneliness Scale (D. Russell, L. A. Peplau, & M. L. Ferguson, 1978), the Family Structure Assessing Instrument (A. Gülerce, 1996), and an author-constructed questionnaire involving demographic information and variables on peer relations. Results of multiple regression analyses indicated that all three sets of variables accounted for 41% of the variance in loneliness scores. Additionally, peer relations contributed 34% of the variance, family structure 14%, and demographic variables 3%. Within the limits of the study, peer relations appear to be the best predictors of adolescent loneliness.

Adolescent↗

PubMed2003

Diffusion-weighted MR imaging with apparent diffusion coefficient and apparent diffusion tensor maps in cervical spondylotic myelopathy.

PURPOSE: To evaluate diffusion-weighted magnetic resonance (MR) imaging in patients with cervical spondylosis and/or myelopathy. MATERIALS AND METHODS: A multishot echo-planar imaging sequence with calculation of apparent diffusion coefficient (ADC) and apparent diffusion tensor (ADT) was applied in 36 patients with symptomatic cervical spondylosis. Diffusion-weighted images read by two neuroradiologists were compared with T2-weighted fast spin-echo images read independently by three neuroradiologists with regard to clinical status (n = 36). MR findings in a selected subgroup of 20 patients whose clinical status was confirmed by electrophysiologic examination also were compared. Sensitivity, specificity, positive predictive value, and negative predictive value of both T2-weighted imaging and diffusion-weighted imaging (ADC and ADT) were calculated and compared. RESULTS: Patients with myelopathy had abnormal ADC (17 of 21) and ADT (15 of 19) maps with increased ADC and ADT values and decreased anisotropy. For the detection of myelopathy, diffusion-weighted ADC maps had a sensitivity of 80% (17 of 21), while T2-weighted images had a sensitivity of 61% (13 of 21). The negative predictive value was 63% (seven of 11) and 60% (12 of 20) for ADC maps and T2-weighted images, respectively. Conversely, the specificity of diffusion-weighted images (53%; seven of 13) was lower than that of T2-weighted images (92%; 12 of 13). In patients with myelopathy confirmed at electrophysiologic examination, the sensitivity of diffusion-weighted images increased to 92% (12 of 13) and the negative predictive value increased to 75% (three of four), while T2-weighted images had a 53% (seven of 13) sensitivity and a 50% (six of 12) negative predictive value. CONCLUSION: Diffusion weighting improved the sensitivity of imaging in cervical spondylotic myelopathy.

Adult↗