Samsung HS50 Manual de usuario descargar pdf (Pagina 245)

8-101

Chapter 8 Measurements and Calculations

Tips!

When represented by SD, a point near to the average indicates a value closer to ±0 SD and a point

further away from the average indicates a value closer to the maximum or minimum value. 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, the 50th 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 while 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:

X

When references are created based on SD:

− -2.0 SD – +2.0 SD (when converted to Percentile: 2.28 Percentile – 97.72 Percentile)

− -1.5 SD – +1.5 SD (when converted to Percentile: 6.68 Percentile – 93.32 Percentile)

− -1.0 SD – +1.0 SD (when converted to Percentile: 15.87 Percentile – 84.13 Percentile)

X

When references are created based on Percentile:

− 2.5 Percentile – 97.5 Percentile (when converted to SD: -1.96 SD – 1.96 SD)

− 5.0 Percentile – 95.0 Percentile (when converted to SD: -1.645SD – 1.645 SD)

− 10.0 Percentile – 90.0 Percentile (when converted to SD: -1.288 SD – 1.288 SD)

1 2 ... 240 241 242 243 244 245 246 247 248 249 250 ... 281 282

OSCAR 23 Apr 2025 | 08:21:36

Samsung HS50 Manual de usuario Pagina 245