Table 6. Correlation Coefficients (r) Between Indicators of Clinical Status and Lymphocyte Proliferative Responses to Phytohemagglutinin (PHA) (corrected for baseline 3H-thymidine uptake) in Children With Sickle Cell Disease
VariablePHA 2.5 μg/mLPHA 5 μg/mLPHA 10 μg/mLPHA 15 μg/mL
Retinol binding protein0.242a0.307a0.349a0.367a
Health scoreb−0.319a−0.272a−0.287a−0.326a
Pain crises−0.252a−0.182−0.195−0.195
Units of blood−0.195−0.243a−0.266a−0322a
  • a The (r) value is significantly different from zero (P < 0.05).

  • b Health score is the sum of the number of episodes of pain crisis, infection, hospital admission, and/or blood units received.