Table 3

Association between residual ADAMTS13 activity and phenotypic outcomes

PhenotypeADAMTS13 activity unadjusted analysis, %ADAMTS13 activity adjusted for family clustering, %
Age at first TTP episode requiring FFP, y*   
    beta (95% CI) 3.242 (1.432 to 5.052) 3.260 (1.535 to 4.986) 
    R2 0.334 0.419 
    P 0.001 0.001 
Total no. of lifetime TTP episodes*   
    beta (95% CI) −2.081 (−4.442 to 0.281) −2.082 (−4.443 to 0.279) 
    R2 0.112 0.150 
    P 0.082 0.081 
Annual rate of TTP episodes*   
    beta (95% CI) −0.306 (−0.500 to −0.111) −0.306 (−0.502 to −0.110) 
    R2 0.285 0.309 
    P 0.003 0.004 
Multiple TTP episodes   
    OR (95% CI) 0.798 (0.519 to 1.225) 0.795 (0.517 to 1.225) 
    P 0.302 0.299 
Neonatal jaundice and/or thrombocytopenia   
    OR (95% CI) 0.879 (0.616 to 1.255) 0.878 (0.615 to 1.255) 
    P 0.478 0.475 
Persistence of renal/neurological damage   
    OR (95% CI) 2.014 (0.863 to 4.699) 2.285 (0.805 to 6.485) 
    P 0.105 0.120 
Regular FFP prophylaxis   
    OR (95% CI) 0.625 (0.410 to 0.954) 0.625 (0.409 to 0.955) 
    P 0.030 0.030 
PhenotypeADAMTS13 activity unadjusted analysis, %ADAMTS13 activity adjusted for family clustering, %
Age at first TTP episode requiring FFP, y*   
    beta (95% CI) 3.242 (1.432 to 5.052) 3.260 (1.535 to 4.986) 
    R2 0.334 0.419 
    P 0.001 0.001 
Total no. of lifetime TTP episodes*   
    beta (95% CI) −2.081 (−4.442 to 0.281) −2.082 (−4.443 to 0.279) 
    R2 0.112 0.150 
    P 0.082 0.081 
Annual rate of TTP episodes*   
    beta (95% CI) −0.306 (−0.500 to −0.111) −0.306 (−0.502 to −0.110) 
    R2 0.285 0.309 
    P 0.003 0.004 
Multiple TTP episodes   
    OR (95% CI) 0.798 (0.519 to 1.225) 0.795 (0.517 to 1.225) 
    P 0.302 0.299 
Neonatal jaundice and/or thrombocytopenia   
    OR (95% CI) 0.879 (0.616 to 1.255) 0.878 (0.615 to 1.255) 
    P 0.478 0.475 
Persistence of renal/neurological damage   
    OR (95% CI) 2.014 (0.863 to 4.699) 2.285 (0.805 to 6.485) 
    P 0.105 0.120 
Regular FFP prophylaxis   
    OR (95% CI) 0.625 (0.410 to 0.954) 0.625 (0.409 to 0.955) 
    P 0.030 0.030 
*

On linear regression analysis.

On logistical regression analysis.

Per 1% increase in ADAMTS13 activity.

OR indicates odds ratio.

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