Samsung H60 Manual do Utilizador descarregar pdf (Página 228)

8-110

Operation Manual

Tips!

When expressing with SD, a value approaches ±0 SD as it approaches the mean, and approaches

the minimum or the maximum value as it deviates from the mean. The greater part of the range

falls within ±3 SD, with ±1 SD representing 68.3% of the entire range. Thus it can be seen that most

fetal measurements are tightly clustered around the average value.

The Percentile represents a point in distribution from between 0 and 100 inclusive. Therefore, the

average point is represented as 50 Percentile.

As shown in the ﬁgure, the average point corresponds to 0 SD (that is, 50 Percentile). If a point is in

the range between -1 SD and +1 SD, it falls within 68.3% of the entire range. This means that the

point falls within the range between 16 and 84.

Further, if a point is in the range between -2 SD and +2 SD, it falls within 95.5% of the entire range.

Thus, the point falls in the range between 3 and 97.

The SD and Percentile are interchangeable. Percentile can be used when a fetal measurement

ranking is desired, and SD can be used when the distance between actual fetal measurements and

the average measurement is sought.

While the range of Growth table references that are primarily used with OB measurement data

varies depending on the user, the typical range accepted by most users is as below:

1) When references are created based on SD:

X

-2.0 SD ~ +2.0 SD (if converted to percentile, 2.28 percentile ~ 97.72 percentile)

X

-1.5 SD ~ +1.5 SD (if converted to percentile, 6.68 percentile ~ 93.32 percentile)

X

-1.0 SD ~ +1.0 SD (if converted to percentile, 15.87 percentile ~ 84.13 percentile)

2) When references are created based on Percentile:

X

2.5 percentile ~ 97.5 percentile (if converted to SD, -1.96 SD ~ 1.96 SD)

X

5.0 percentile ~ 95.0 percentile (if converted to SD, -1.645 SD ~ 1.645 SD)

X

10.0 percentile ~ 90.0 percentile (if converted to SD, -1.288 SD ~ 1.288 SD)

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Samsung H60 Manual do Utilizador Página 228