Table 2

Univariate quantile regression model for predicting C-peptide percentiles

Basal C-peptideStimulated C-peptide
25th percentile50th percentile75th percentile25th percentile50th percentile75th percentile
Sibling0.250.110.540.181.000.46
Offspring1.000.500.550.600.610.44
Second degree0.080.400.121.000.150.84
Number of positive antibodies
 1 vs.40.060.100.111.000.270.85
 2 vs. 40.491.000.570.320.510.19
 3 vs. 40.330.091.001.000.650.30
IAA titer0.130.050.290.16<0.0010.02
ICA titer0.621.000.840.250.660.21
GAD65A titer1.001.000.610.631.000.54
ICA512 titer0.470.530.601.000.630.71
HLA (high vs. low risk)0.050.050.090.540.020.31
Sex (female vs. male)0.230.100.540.11<0.0010.01
BMIZ percentile (<85.0 vs. ≥85.0)0.01<0.001<0.001<0.001<0.001<0.001
Age (4–8 vs. 9–18 years)<0.001<0.001<0.001<0.001<0.001<0.001
  • Data are P values.