Table 1.

Clinical and demographic characteristics of the training and testing cohorts stratified by cluster

Training cohortTesting cohort
Cluster 1 (n = 80)Cluster 2 (n = 92)P valueCluster 1 (n = 35)Cluster 2 (n = 37)P value
Age (y) 34.8 ± 11.8 36.3 ± 12.0 .41 38.5 ± 9.1 38.2 ± 11.8 .91 
Female/male (n) 43/37 51/41 .09 17/22 28/22 .29 
HgSS 71 76 .35 29 31 .76 
HgSC 12 .20 .749 
HgSB 1.00 1.00 
BMI (kg/m225.1 ± 6.0 24.8 ± 5.3 .74 22.8 ± 3.8 24.2 ± 6.6 .28 
HU therapy 40 (50%) 48 (52%) .88 16 (53%) 27 (69%) .21 
ACS 73 (91%) 71 (77%) .013 23 (62%) 20 (45%) .18 
WBC (10−3/mm310.7 ± 3.6 9.0 ± 3.4 .002 10.2 ± 3.5 8.6 ± 3.3 .039 
Hg (g/dL) 8.5 ± 1.6 9.1 ± 1.8 .045 8.7 ± 2.0 8.8 ± 1.7 .77 
Creatinine (mg/dL) 0.98 ± 0.83 1.22 ± 1.58 .22 1.02 ± 1.38 1.27 ± 1.80 .47 
HbF (g/dL) 7.1 ± 5.3 8.0 ± 7.6 .39 8.5 ± 8.7 9.4 ± 7.8 .73 
LDH (U/L) 453 ± 222 394 ± 195 .07 378 ± 170 350 ± 154 .50 
Bilirubin (mg/dL) 3.9 ± 3.1 2.3 ± 1.5 .0001 2.8 ± 1.6 2.2 ± 1.6 .13 
AST (U/L) 57.0 ± 69.3 41.5 ± 21.2 .060 47.1 ± 27.4 37.4 ± 17.0 .07 
Peak TRV (≥2.5 m/s) 39.1% 26.3% .109 60.0% 50.0% .487 
Peak TRV (≥3.0 m/s) 12.5% 5.0% .134 14.3% 7.5% .461 
Training cohortTesting cohort
Cluster 1 (n = 80)Cluster 2 (n = 92)P valueCluster 1 (n = 35)Cluster 2 (n = 37)P value
Age (y) 34.8 ± 11.8 36.3 ± 12.0 .41 38.5 ± 9.1 38.2 ± 11.8 .91 
Female/male (n) 43/37 51/41 .09 17/22 28/22 .29 
HgSS 71 76 .35 29 31 .76 
HgSC 12 .20 .749 
HgSB 1.00 1.00 
BMI (kg/m225.1 ± 6.0 24.8 ± 5.3 .74 22.8 ± 3.8 24.2 ± 6.6 .28 
HU therapy 40 (50%) 48 (52%) .88 16 (53%) 27 (69%) .21 
ACS 73 (91%) 71 (77%) .013 23 (62%) 20 (45%) .18 
WBC (10−3/mm310.7 ± 3.6 9.0 ± 3.4 .002 10.2 ± 3.5 8.6 ± 3.3 .039 
Hg (g/dL) 8.5 ± 1.6 9.1 ± 1.8 .045 8.7 ± 2.0 8.8 ± 1.7 .77 
Creatinine (mg/dL) 0.98 ± 0.83 1.22 ± 1.58 .22 1.02 ± 1.38 1.27 ± 1.80 .47 
HbF (g/dL) 7.1 ± 5.3 8.0 ± 7.6 .39 8.5 ± 8.7 9.4 ± 7.8 .73 
LDH (U/L) 453 ± 222 394 ± 195 .07 378 ± 170 350 ± 154 .50 
Bilirubin (mg/dL) 3.9 ± 3.1 2.3 ± 1.5 .0001 2.8 ± 1.6 2.2 ± 1.6 .13 
AST (U/L) 57.0 ± 69.3 41.5 ± 21.2 .060 47.1 ± 27.4 37.4 ± 17.0 .07 
Peak TRV (≥2.5 m/s) 39.1% 26.3% .109 60.0% 50.0% .487 
Peak TRV (≥3.0 m/s) 12.5% 5.0% .134 14.3% 7.5% .461 

BMI, body mass index; HbF, hemoglobin F; HU, hydroxyurea; LDH, lactate dehydrogenase.

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