Each of these potential risk factors was separately entered into a regression model. Additionally, alcohol consumption was considered (depending
on the proportion of subjects with data SYN-117 order for this variable). Baseline demographic characteristics for cases and controls were compared. Crude odds ratios (ORs) and 95% confidence intervals (CIs) were calculated for each risk factor in a univariate analysis using conditional logistic regression, comparing cases and controls. After excluding risk factors that had an insignificant OR or did not reach an overall 1% prevalence, a final, multivariable logistic regression model was derived. Results www.selleckchem.com/products/acalabrutinib.html A total of 792 cases and 4,660 controls were included in the analysis, with 99% of cases having at least five matched controls. Fifty-three percent of the cases and 53.1% of the controls were female, with a mean age of 57.5 years
among cases and 57.6 years among controls. Mean observation time was 8.9 person-years for cases and 9.4 person-years for controls. The most common site of ON was the hip, representing 75.9% of the cases (Table 2). Table 2 Baseline characteristics of cases and controls Cases (N = 792) Controls (N = 4,660) Overall (N = 5,452) Sex Female 420 (53.0%) 2,473 (53.1%) 2,893 (53.1%) Male 372 (47.0%) 2,187 (46.9%) 2,559 (46.9%) Age (years) Mean
(SD) 57.5 Histone demethylase (18.99) 57.6 (18.90) 57.6 (18.91) Median (IQR) 58.5 (42.0–73.0) 59.0 (42.0–73.0) 59.0 (42.0–73.0) Person-years of observation Mean (SD) 8.9 (4.1) 9.4 (4.0) 9.4 (4.0) Median (IQR) 9.3 (5.9–11.8) 9.7 (6.3–12.5) 9.7 (6.2–12.5) Site of osteonecrosis Hip 601 (75.9%) 0 (0.0%) 601 (11.0%) Wrist 36 (4.5%) 0 (0.0%) 36 (0.7%) Knee 20 (2.5%) 0 (0.0%) 20 (0.4%) Shoulder 18 (2.3%) 0 (0.0%) 18 (0.3%) Foot 15 (1.9%) 0 (0.0%) 15 (0.3%) Ankle 13 (1.7%) 0 (0.0%) 13 (0.2%) Jaw 3 (0.4%) 0 (0.0%) 3 (0.1%) Othera 20 (2.5%) 0 (0.0%) 20 (0.4%) NOS 66 (8.3%) 0 (0.0%) 66 (1.2%) aOther sites (≤5 cases each) included head of humerus, medial check details femoral condyle, talus, femoral condylar, larynx, pelvis, rib, temp bone, and tibia SD standard deviation; IQR interquartile range; NOS not otherwise specified The age-adjusted annual incidence rates of ON by sex and the osteonecrosis incidence rates by sex and age cohort are shown in Figs. 1 and 2. Overall, the recorded incidence of ON increased over time from approximately 1.4/100,000 in 1989 to approximately 3/100,000 in 2003.