Beckman unicel dxc 660i synchron access

According to literatures, the following variables were regarded as covariates. Demographic variables including age, sex (Male, Female), race (Hispanic, Non-Hispanic White, Non-Hispanic Black, and Other Races), education (< High school, High school, >High school) were collected from demographic data. The medical conditions including hypertension and diabetes were defined by the participants' self-reported physician's diagnosis. The serum albumin (g/dL), globulin (g/dL), AST (IU/L), total protein (g/dL), uric acid (mg/dL) were measured using Beckman UniCel^® DxC 800 Synchron & Beckman UniCel^® DxC 660i Synchron Access Clinical Systems (Identical Method). White blood cell counts (1,000 cells/uL) and hemoglobin (g/dL) measurement were performed using the Coulter^® DxH 800 analyzer. High sensitivity C-Reactive Protein (HS-CRP) was measured using Beckman UniCel^® DxC 600 Synchron & Beckman UniCel^® DxC 660i Synchron Access Clinical Systems (Identical Method). Details of the specimen collection, processing, quality assurance and monitoring are available at NHANES website.

The exposure variable in the study was serum ALP, analyzed using Beckman UniCel DxC 800 Synchron and Beckman UniCel DxC 660i Synchron Access Clinical Systems methods at Collaborative Laboratory Services, L.L. (https://wwwn.cdc.gov/Nchs/Nhanes/2015–2016/BIOPRO_I.htm). The studied outcome variable was pelvic BMD, measured by dual-energy x-ray absorptiometry scanning by trained and certified radiologic technologists using the Hologic Densitometer Discovery A (https://wwwn.cdc.gov/Nchs/Nhanes/2015–2016/DXX_I.htm).
The analyzed covariates included sex, age, race, education level, body mass index, smoking history (a smoker was defined as a person who smoked at least 100 cigarettes in life), alcohol consumption (a consumer was defined as a person who drank at least 12 alcoholic drinks in 1 year), and the levels of alanine aminotransferase, aspartate aminotransferase, lactate dehydrogenase, gamma-glutamyl transferase, triglycerides, uric acid, serum calcium, and serum phosphorus. Examination of the physiologic, clinical, and laboratory parameters was conducted by trained medical experts. More information on variable measurement is available on the NHANES website (https://www.cdc.gov/nchs/nhanes).