54. A neonatal unit wants to know which of two oxygen delivery systems is associated with a higher incidence of bronchopulmonary dysplasia (BPD) in infants discharged from the hospital in the last two years. Given the following data: Infant Diagnoses by Oxygen Delivery Systems N=100
Answer: D
There is an estimated correlation of 1.0 between both systems and BPD.
The data indicates that there is a strong positive correlation of 1.0 between the first oxygen delivery system and the incidence of bronchopulmonary dysplasia (BPD), suggesting that this system is associated with a higher risk of BPD in infants.
A) Oxygen system one is positively related at 1.0 and Oxygen system two at -1.0
This option incorrectly states the relationship of the two oxygen systems. While it accurately describes oxygen system one's correlation as positive at 1.0, it inaccurately presents oxygen system two's correlation as -1.0, which misrepresents the data and does not reflect a comparison relevant to BPD incidence.
B) Oxygen system two is positively related at 1.0 and Oxygen system two at -1.0
This choice contains a typographical error, referencing oxygen system two twice. Moreover, it incorrectly claims a positive correlation of 1.0 for oxygen system two while mentioning a negative correlation, which is contradictory and unsupported by the data provided, making it an invalid option.
C) There is an estimated correlation of 2.0 between both systems and BPD
This option is factually incorrect as it reports a correlation of 2.0, which exceeds the maximum possible correlation coefficient of 1.0. Such a correlation value cannot exist in statistical terms, rendering this option invalid and unfounded based on the data.
D) There is an estimated correlation of 1.0 between both systems and BPD
This statement accurately reflects the data indicating a strong positive correlation of 1.0 between the first oxygen delivery system and the incidence of BPD. This suggests that as the use of this oxygen system increases, so does the incidence of BPD, making it the correct answer.
Conclusion
The correct answer, D, highlights a significant positive correlation between the first oxygen delivery system and the incidence of BPD, indicating a potential risk factor for infants. In contrast, the other options either misrepresent the data, contain errors, or exceed statistical limits, confirming that D is the only valid choice based on the provided information.