The role of clinical markers including kidney length and cortex width, CCR and p 2 -microglobulin were determined separately for two periods, 2003-2004 and 2005-2006, in the survival analysis. All clinical markers had a continuous scale. Because of a skewed distribution, the natural logarithm of urinary p 2 -microglobulin, urinary total protein and urinary albumin concentration was used. Interactions between gender or parental history of BEN with each clinical marker were also assessed. A two-sided P 0.05 was considered statistically significant. Model fits and outliers were identified using residual analysis. All covariates were initially assessed for time-dependent effects using a test based on the Schoenfeld residuals, a standard score process test and time-dependent interaction. [35],[36] The proportional hazard assumption was not violated in any model. Intraclass correlation coefficients (ICCs) were used to examine relationships between continuous clinical measurements. Analyses were conducted in SAS 9.2. [37]
The role of clinical markers including kidney length and cortex width, CCR and p 2 -microglobulin were determined separately for two periods, 2003-2004 and 2005-2006, in the survival analysis. All clinical markers had a continuous scale. Because of a skewed distribution, the natural logarithm of urinary p 2 -microglobulin, urinary total protein and urinary albumin concentration was used. Interactions between gender or parental history of BEN with each clinical marker were also assessed. A two-sided P 0.05 was considered statistically significant. Model fits and outliers were identified using residual analysis. All covariates were initially assessed for time-dependent effects using a test based on the Schoenfeld residuals, a standard score process test and time-dependent interaction. [35],[36] The proportional hazard assumption was not violated in any model. Intraclass correlation coefficients (ICCs) were used to examine relationships between continuous clinical measurements. Analyses were conducted in SAS 9.2. [37]
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