Table 4.

Comparison of different working correlation structures using quasilikelihood information criterion

Working CorrelationsEstimate, ml/min per 1.73 m2SEM, ml/min per 1.73 m2 per yearP ValueQIC
Independence−0.170.320.6084,143.50
Exchangeable−0.940.21<0.00184,137.98
Autoregressive−1.330.23<0.00184,140.64
  • Coefficients for year × APOL1, with APOL1 =2. Exchangeable correlation structure achieved the smallest QIC and hence, was more appropriate for the data. QIC, quasilikelihood information criterion.