Sample size and covariates correlated with autoantibody measurements.

p-values and estimated odds ratios (OR) for the effect of covariates on autoantibody measurements (logistic regression controlling for other significant covariates). The sample size, n, refers to the number of samples with autoantibody data. For time since diagnosis and age at diagnosis, odds ratios are reported for a 10 year difference. GWA indicate the total number of samples genotyped either on the AffymetrixGeneChip Human Mapping 500 K or Illumina 550 K arrays with autoantibody data.†: Time since diagnosis is highly correlated with patient's age at venepuncture (correlation coefficient ρ = 0.85). NS: Non significant (p>0.01).