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However, the extent of coexistent multiple medical complications in SCD have not been well described. Most previous large natural history studies, such as those from the Cooperative Study of Sickle Cell Disease (CSSCD) [9], focused on in-depth characterizations of specific complications. The relationship of SCD complications to diminished health-related quality of life (HRQOL) has been established for frequent sickle pain or opioid usage [10�C13]. The small size of these prior HRQOL studies limited their ability to examine the HRQOL effects of other less frequent SCD complications. During the 2003�C2008 funding cycle of the Comprehensive Sickle Cell Centers (CSCC), the investigators developed and implemented a clinical database (the C-Data Project) http://www.selleck.cn/products/AP24534.html to record the occurrence of 62 selected SCD complications http://www.selleckchem.com/products/jq1.html in a cohort of adults and children seen at the participating clinical sites. Nineteen of these SCD-related complications were selected for use in this study based on their clinical relevance, relative frequency, and their potential influence on HRQOL [14]. Of the 1,180 enrolled subjects, 1,067 individuals completed Medical History I and II, and the SF-36 (See Methods). The average age of the 545 women (52%) and 501 men (48%) was 31.4 years (standard deviation [SD] 11.8) with a range of 18�C72 years (median 28 years). The participants were largely Black (90%) of non-Hispanic ethnicity (92%). The sample included 763 adults with SS or S��0 thalassemia (73%) and 283 adults with SC or S��+ thalassemia (27%). (Supporting Information Table I). The prior occurrence of acute vaso-occlusive (sickle cell) pain was the most common complication (89%) followed by acute chest syndrome (69%), and gall bladder disease (49%). A number of chronic complications were relatively common, including avascular necrosis (AVN) of the hips/shoulders (29%), transfusion-related http://www.selleckchem.com/products/Rapamycin.html iron overload (17%), priapism (16%), leg ulcers (12%), and retinopathy (12%). Two distinct associated medical conditions were prevalent: asthma (20%) and hypertension (12%). Continuous use of oral opioids greater than 30 days in the prior year was reported by 37%, whereas oral antidepressants use was reported by 11%. (Supporting Information Table I). Most adults had experienced more than one SCD-related complication (mean 3.8 �� 2.0, median 4), and more than one affected organ system (mean 3.3 �� 1.5, median 3) (Supporting Information Figure 1A, 1B). The number of complications increased substantially with increasing age (P