BME100 f2015:Group1 1030amL3

From OpenWetWare
Jump to navigationJump to search
BME 100 Fall 2015 Home
Lab Write-Up 1 | Lab Write-Up 2 | Lab Write-Up 3
Lab Write-Up 4 | Lab Write-Up 5 | Lab Write-Up 6
Course Logistics For Instructors
Wiki Editing Help


Nichole Torgerson
Matt Chrest
Lindsey O'Brien
Jacob Aperi
Otis Clyne
Alarmel Sira


Descriptive Statistics

Mean Temperature: Gold Standard: 97.256 Dg F

Mean Temperature: Spree Headband: 99.267 Dg F

Mean Heart Rate: Gold Standard: 88.924 BPM

Mean Heart Rate: Spree Headband: 88.303 BPM

Standard Deviation - Temperature: Gold Standard: 1.170267263 Dg F

Standard Deviation - Temperature: Spree Headband: 1.347485029 Dg F

Standard Deviation - Heart Rate: Gold Standard: 23.2322048 BPM

Standard Deviation - Heart Rate: Spree Headband: 23.0256162 BPM

Standard Error - Temperature: Gold Standard: 0.06051308 Dg F

Standard Error - Temperature: Spree Headband: 0.069676792 Dg F

Standard Error - Heart Rate: Gold Standard: 121271122 BPM

Standard Error - Heart Rate: Spree Headband: 1.2027476 BPM



We used A T-Test to determine Significance between the Gold standard and the Spree Headband.

T-test value for Temperature: 4.69577E-77

T-test value for Heart Rate: .39021762

Pearson's Correlation:

Temperature: 0.167425906

Heart Rate: 0.82332945

Since the Pearson's value for Heart Rate is close to 1, the Spree headband has a direct relationship with the Gold standard, meaning that they both increase and decrease in equal amounts.

For Temperature, the Pearson's value is farther away from 1, so there correlation is less noticeable than with the heart rate. The Spree headband and the Gold standard will increase and decrease differently.

The T-test value for Temperature is smaller than .05, therefore the spree is significantly different to the gold standard. This difference means that the Spree headband was inefficient at taking temperature.

The T-test for Heart Rate is greater than .05, meaning that there is little difference between the data. Therefore the Spree headband was reliably showing the correct heart rate.


Gold standard = Pulse Oximeter (heart rate)

Gold standard = thermometer (temperature)

Design flaws:

1)Uncomfortable- The Spree is made of a material that is particularly uncomfortable. on the forehead it is really tight and if left in for an extended amount of time, can cause a headache. The stiff edges do not add anything either, they leave unattractive marks on the forehead. Lastly the elastic band that wraps around the back of the head is very uncomfortable as well. All of these uncomfortable aspects of the spree can be reduced if not eliminated if the material used was not rubber. Any type of soft cloth on the head or an actual headband material with a casing in a softer material would help.

2)Poor bluetooth connection- There should be an aspect of the app to where the user can enter the Spree's unique bluetooth signal. So perhaps an area when you first start the app that asks for an ID label. This should solve the problem of mass connections problems such as this lab experienced in this lab.

3)Inconvenient positioning of sensor- There is not much appeal to the sensor being located on the forehead. It would be much better if placed on the chest or wrists. Because it is out in the open instead of under a shirt on a chest, the Spree sensor is vulnerable to factors that can change and skew the temperature data; sun, wind, sweat, precipitation, to mention just a few.

4)Low update frequency- The Spree band has a low capacity to update. This leaves users waiting for data. This is a problem especially when users are doing workouts and have a low rest tie and would like an update on what their vitals are at a rather fast pace. Simply by adding a little more processing power, the spree could update more often and give much immediate data.


Target Population and Need

Target Population

The American Sleep Apnea Association (ASAA) states that 22 million people in the United States have sleep apnea. Of those 22 million, 80% cases are undiagnosed. Risk factors for sleep apnea include, being male, overweight, over the age of 40. But that doesn't mean only males, that are overweight and over 40 years of age are susceptible to sleep apnea. Everyone is at risk according to the ASAA. Sleep apnea is seen in infants, and women but is most prominent in males over 40 and especially those that are overweight.

Needs of the Population

Patients need their airways in the throat to open up so that the flow of air can be restored and they may start breathing again. There are a multitude of ways to go about this. We have approached this by moving the resting place of the tongue. With our mouthguard, the goal is to have the patient be as comfortable as possible, this means no excess saliva, no altered bite, no dry mouth/lips, or teeth movement.

Problem Understanding Form

Device Design

Depicted above is a landscape view of our mouthpiece. The design is supposed to be fitted around back bottom molars of the mouth, to firmly compress the tongue in place, keeping the airway open.

This is an above view of the Mouthpiece, showing clearly the plastic layer to sit on the tongue, and the wire frames that will fit with the molar teeth.

An angled view of the product, showing all elements of our design and its functionality.

Inferential Statistics

A paired t-test was run to calculate the difference in number of Apnic episodes per night between the Happy Nappy and the CPAP. The t-test yielded a t value of 2.188096, which means the Happy Nappy and the CPAP are statistically different. Being statistically different means the two have different results, therefore the Happy Nappy has better results and is more effective at reducing the number of Apnic episodes per night than the CPAP is.

The Pearson's r correlation equation yielded an r coefficient of 0.124489, which means there is no correlation between the CPAP and the Happy Nappy.