Table 3.

Imaging and clinical predictors of incident overt stroke and recurrent silent infarcts in children with sickle cell anemia and silent cerebral infarcts in the SIT Trial

Odds ratio (95% confidence interval)P
Prediction of incident overt stroke: non-randomized and randomized children (N = 286)   
 Imaging predictors   
  FLAIR lesion volume (% of brain) 9.20 (3.01-28.08) .001 
  Gray to white matter FLAIR volume ratio — — 
  Percentage of lesion volume inside 90% heat map — — 
 Clinical predictors   
  Age at registration, years — — 
  Steady-state reticulocytes (%) 1.10 (1.01-1.20) .008 
  Parental report of recurrent headaches — — 
Prediction of incident overt stroke and recurrent silent infarcts: randomized children only (N = 196)   
 Imaging predictors   
  FLAIR lesion volume (% of brain) — — 
  Gray to white matter FLAIR volume ratio — — 
  Percentage of lesion volume inside 90% heat map — — 
 Clinical predictors   
  Age at randomization, years 0.72 (0.56-0.89) .004 
  Steady-state reticulocytes (%) 1.10 (1.01-1.22) .040 
  Parental report of recurrent headache 4.06 (1.43-12.85) .011 
  Randomization to transfusion (vs observation) 0.30 (0.09-0.88) .036 
Odds ratio (95% confidence interval)P
Prediction of incident overt stroke: non-randomized and randomized children (N = 286)   
 Imaging predictors   
  FLAIR lesion volume (% of brain) 9.20 (3.01-28.08) .001 
  Gray to white matter FLAIR volume ratio — — 
  Percentage of lesion volume inside 90% heat map — — 
 Clinical predictors   
  Age at registration, years — — 
  Steady-state reticulocytes (%) 1.10 (1.01-1.20) .008 
  Parental report of recurrent headaches — — 
Prediction of incident overt stroke and recurrent silent infarcts: randomized children only (N = 196)   
 Imaging predictors   
  FLAIR lesion volume (% of brain) — — 
  Gray to white matter FLAIR volume ratio — — 
  Percentage of lesion volume inside 90% heat map — — 
 Clinical predictors   
  Age at randomization, years 0.72 (0.56-0.89) .004 
  Steady-state reticulocytes (%) 1.10 (1.01-1.22) .040 
  Parental report of recurrent headache 4.06 (1.43-12.85) .011 
  Randomization to transfusion (vs observation) 0.30 (0.09-0.88) .036 
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