Transient hypothyroxinemia a common finding in premature infants, is not thought to have long term consequences or to require treatment. A study was performed to investigate subsequent motor and cognitive abnormalities. [17] Blood thyroxinemia values were obtained on routine screening in the first week of life from 536 infants who weighed 2000 g or less at birth and were born at 33 weeks gestation or earlier. The data in Table 11.23 were presented concerning the relationship between mean thyroxine level and gestational age. What is the best fitting regression line relating mean thyroxine level to gestational age? Is there a significant association between the thyroixine level and gestational age? Report a p value.