Sas graph software

Categorical variables are presented as number and percentage, and continuous variables, as mean and standard deviation (SD); median 25th and 75th percentiles, minimum, and maximum were also calculated. The association between risk factors and time to meningioma diagnosis was assessed using Cox proportional hazard models; hazard ratios (HR), 95% confidence intervals (95% CI), and p-values were calculated. Log minus log figures were inspected to confirm the proportionality of the hazard. Crude rates were also determined. Independent variables were initially entered individually into the Cox model. After sex and the interaction of sex and height were found to be statistically significant, separate models were established for men and women. A Cox regression cubic spline function with three equally spaced knots positioned between the minimum and maximum values of height was fit to the data to estimate the height value associated with minimum risk of meningioma in men (SAS/STAT and SAS/GRAPH software, version 9.4, SAS Institute Inc., Cary, NC, USA). Other statistical analyses were performed with SPSS Statistics for Windows, version 24.0 (IBM, Armonk, NY, USA). Two-sided p-values of ≤0.05 were considered statistically significant.