BME100 f2015:Group9 8amL3
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ContentsOUR TEAMLAB 3A WRITEUPDescriptive StatisticsThe data shows the averages of all combined group data gathered in heart rate in beats per minute throughout the course of the lab experiment by the gold standard and spree devices. Below these are the accompanying standard deviations, number of data entries count, and standard error. The temperature data was taken using a spree headband and a normal thermometer, where the thermometer is the golden standard. The average, standard deviation, count, and standard error for each data group are listed here.
Results
There was statistical difference between the groups because the pvalue was less than 0.05. This difference was most likely due to the spree band measuring temperature by levels 14 instead of the actual temperature in degrees. The levels were later converted to approximate values of temperature but the significant difference still remains.
AnalysisPearson's R correlation for the difference of heart rate when measured by gold standard and Spree was calculated to be 0.633018213. The definition of this concept involves the strength of the linear association between two variables. This value, denoted by r, shows that there is not a strong correlation between the data and thus the results are not significant enough to prove the strength of the Spree as a heart rate sensor. The closer the r value is to 1 the stronger the association between the two variables. A ttest was conducted for the heart rate study between the two devices because there were only 2 groups to compare. The results were paired based on the fact that the samples were related as the same subject was constantly being tested. The pvalue for this test was 0.352513466, and because this value is so high when compared to the pvalue (0.05) to achieve significance, the data was determined to not be significant. Because the p value was determined to be greater than the five percent level of significance conducted in the experiment and the Pearson's R correlation was found to be 0.633018213, there was not enough power to prove that the Spree was accurate compared to the Gold Standard. Pearson's R correlation for the difference in temperature when measured by the gold standard and Spree was calculated to be 0.196248713. This means that the two variables were not very closely associated with each other. For two groups to be considered strongly correlated with each other the rvalue should be very close to 1. The pvalue found from the comparison of these two groups suggests that the spree band was very inaccurate and measuring temperature. A ttest was also conducted for the temperature data from the spree band and the gold standard. The ttest showed that there was a significant difference in the two groups, which is understandable based on the spree bands method of temperature tracking. Over all the temperature data was not considered significant because it was measured using a 14 level system that did not read an actual temperature in degrees, leaving the values of the spree band to be assumptions instead of actual measurements.
Summary/DiscussionThe spree device was difficult to establish a connection with at times, and when it was it was unreliable in terms of gaining the data at the proper time. For example, there were a couple data entries with no spree data entered simply because the heart rate could not be found at the proper minute interval. This could be fixed simply by creating a means of establishing a stronger bluetooth connection. In terms of personal use, the spree band is aesthetically unappealing, tight, and a nuisance. There are not many ways to improve on this other than becoming more comfortable and discreet, perhaps going the route that many other sports bands have taken with utilization of the wrist.
LAB 3B WRITEUPTarget Population and NeedThe targeted population for this device involves older individuals and more specifically those that are age 60+. This population was targeted based on the data provided by the American Heart Association which reads that the percent of population who suffers heart attacks is 19.9% in males and 9.7% in females from age 6079. After the age of 80, the percent of population with males and females is 32.2% and 18.8% respectively. The need of this product plays off the idea that individuals with advanced age require a device that is both subtle and effective in measuring important problems associated with their body. The product, a ring that measures heart rate and blood pressure, allows the user to satisfy this need. Need can also be attributed to the goal of peace of mind during times of critical and everyday health. By allowing the user to know if something is wrong with their current body levels, the specific need above was achieved. There are already devices that alert the hospital if there is a medical problem when it occurs. This device aims to alert people of possible problems before they occur, allowing them to get medical assistance and avoid a stressful emergency situation.
http://www.heart.org/idc/groups/heartpublic/@wcm/@sop/@smd/documents/downloadable/ucm_449846.pdf
Device DesignThe design of the device was mainly focused on generating an accurate and precise biosensor as well as one that is very convenient for the user. The device was manufactured out of carbon fiber, a lightweight material that holds a very low profile and also looks stylish. The sensor was placed under the ring so that it was in constant contact with the underpart of one's finger. An embedded wifi chip was necessary as it gives the users and doctors the possibility to follow a trend in their measurements. A small LED light is positioned on the outside of the ring to warn the wearer that there is a possible issue with their heart and that they should seek medical attention right away. The device is made to order so that it is the perfect fit for all.
Inferential StatisticsSystolic Blood Pressure Scatter plot: Diastolic Blood Pressure Scatter plot:
GraphBecause two similar groups were being compared, a paired ttest was conducted for the difference in heart rate between the gold standard and the Viva Ring. The pvalue for this paired ttest was 0.690105843. Because this value is greater than .05, the two groups were not significantly different from each other. Because two similar groups were being compared, a paired ttest was conducted for the difference in systolic blood pressure between the gold standard and the Viva Ring. The pvalue for this paired ttest was 0.581832904. Because this value is greater than .05, the two groups were not significantly different from each other. Because two similar groups were being compared, a paired ttest was conducted for the difference in diastolic blood pressure between the gold standard and the Viva Ring. The pvalue for this paired ttest was 0.987060294. Because this value is greater than .05, the two groups were not significantly different from each other.
