BME100 f2015:Group7 8amL3

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OUR TEAM

 Name: Andrew Medina Name: Farah Al Yasari Name: Rafael Lopez Name: Kelly Harper Name: Tristan Loveday Name: Jeremy Atkinson

LAB 3A WRITE-UP

Descriptive Statistics

Temperature:

Spree

```    Count:373
```
```    Average:98.80697
```
```    Standard Deviation: 1.193736
```
```    Standard Error: 0.061809
```

Thermometer (Gold Standard)

```    Count:373
```
```    Average:97.27268097
```
```    Standard Deviation:1.020886868
```
```    Standard Error: .052859518
```

T-Test: 7.93663e-60

Pearson's R: .087158866

Heart Rate-

Spree

```    Count:345
```
```    Average: 96.7942
```
```    Standard Deviation: 23.45037
```
```    Standard Error: 1.262525
```

Pulse-ox (Gold Standard)

```    Count:345
```
```    Average: 95.82029
```
```    Standard Deviation:23.00208
```
```    Standard Error: 1.23839
```

T-Test: 0.102593

Pearson's R: 0.88692

Temperature:

Heart Rate:

Analysis

Heart Rate Analysis:

Because the t-test for the heart rate values was greater than 0.05 (5% confidence interval) at approximately 0.103, the heart rate data from the pulse ox and the spree headband were not statistically different. This indicates that the spree headband was indeed recording accurate data of heart rate. If the headband’s data was statistically different, that would indicate that the headband was recording information that was different that the gold standard. The headband would therefore be considered less precise. The Pearson value for the spree and pulse ox data was approximately 0.887. As this number is close to 1, it indicates a strong, although not perfect, positive correlation between the data sets. This means that the spree headband, while not recording identical information to the pulse ox, did give similar heart rate readings. The spree headband therefore appears to be a good measure of heartrate, although it is not completely accurate.

Temperature Analysis:

The t-test value for temperature was incredibly small (approximately 7.937*10^-60), meaning that the values for the spree headband and the thermometer where statistically different. The spree headband is therefore not precise, as its readouts were different from the accepted gold standard of the thermometer. The Pearson’s R value for the spree and the thermometer data was approximately 0.087. Although it is positive, indicating a positive correlation, the correlation is very weak. If the spree headband accurately recorded body temperature, there would have been a strong correlation, with an R value approaching one.

Summery (Design Flaws) – Spree Headband:

LAB 3B WRITE-UP

Target Population and Need

1. The target population for our device is anyone who plays a sport that is at risk for suffering a concussion. Certain sports, especially contact sports, give athletes a high chance for developing a concussion through repeated, high force impacts that can cause brain injury. These sports include football, soccer, hockey, and others. 2. This target population could use a device that can accurately assess the risk that the wearer has sustained a concussion. The problem in many sports is that athletes will develop a concussion from a high force collision, and then either not realize it or stay in the game regardless. Often athletes may choose to remain in the game to improve their chances of making the team, or the team’s chances of winning. In doing so they risk further damaging their brains and suffering serious health complications. Our device will measure changes in acceleration, and send this data wirelessly to trainers on the sideline during games or practice. If players register collisions of a high enough change in acceleration, they will be flagged by the device for a potential concussion. The device will also measure brain swelling via tympanometry (measuring vibrations in the middle ear). If swelling is recorded, they player will be flagged by the device. This two sided approach will make it much less likely that a concussion occurs unnoticed, improving diagnosis of sports related concussions.

Inferential Statistics

Acceleration:

Accelerometer (Golden Standard)

```    count: 20
```
```    average:49.3
```
```    standard deviation:4.027537
```
```    standard error:0.900585
```

BrainSaver

```    count: 20
```
```    average: 49.05
```
```    standard deviation: 4.211201
```
```    standard error: 0.41653
```

t-test: 0.329877

pearson's r: 0.964145

Frequency:

Tympanometer (Gold Standard

```    count: 20
```
```    average: 4.26
```
```    standard deviation: 0.114248
```
```    standard error: 0.025547
```

BrainSaver

```    count: 20
```
```    average: 4.265
```
```    standard deviation: 0.138697
```
```    standard error: 0.031014
```

t-test: 0.748137

pearson's r: 0.870225

Graph

Brainsaver is 1, golden standard is 2.