Table 2. Left Ventricular Size, Systolic Function, and Massa.
| Variable | Median (Range) | P Value vs Normative Data |
|---|---|---|
| EDV/BSA ratio | 63.4 (43.6 to 79.8) | NA |
| EDV z score | 0.6 (−1.1 to 2.5) | .009 |
| EDV z score using ideal body weight | −0.5 (−2.5 to 2.7) | .04 |
| ESV:BSA ratio | 19.2 (13.8 to 28.5) | NA |
| ESV z score | 0.5 (−2.1 to 2.3) | .02 |
| ESV z score using ideal body weight | −0.4 (−1.9 to 2.1) | .20 |
| Ejection fraction, % | 0.7 (0.6 to 0.8) | NA |
| Mass:BSA ratio | 54.9 (40.6 to 98.9) | NA |
| Mass z score | 0.8 (−0.5 to 3.6) | <.001 |
| Mass z score using ideal body weight | −0.2 (−1.2 to 2.6) | .57 |
| Mass to volume ratio | 0.9 (0.7 to 1.6) | NA |
Abbreviations: BSA, body surface area; EDV, end-diastolic volume; ESV, end-systolic volume; NA, not applicable.
a
The z scores were calculated using previously published normative data from the echocardiography laboratory at Boston Children’s Hospital. The P values were calculated by comparing median z scores against the expected population mean value of 0.