BME100 f2014:Group31 L3

BME 100 Fall 2014	Home People 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 Photos Wiki Editing Help
OUR TEAM Name: Charles Bolton Name: Andy Chang Name: Michael Chatarachanwong Name: Afshin Isadvesta Name: Andrew Liu Name: Jimmy Xu LAB 3A WRITE-UP Descriptive Statistics Temperature Readings PreWalk Gold Standard Mean: 97.43860606, Std. Dev (Farenheit)0.782922836, Count:164, Std. Error 0.061136002 Walk Gold Standard Mean: 97.41843434, Std. Dev (Farenheit)0.882974589, Count:395, Std. Error 0.044427273 CD Gold Standard Mean: 97.87127273, Std. Dev (Farenheit)0.801682045, Count:164, Std. Error 0.06260085 PreWalk Spree Mean: 101.4727273, Std. Dev (Farenheit)2.621588693, Count:164, Std. Error 0.204711684 Walk Spree Mean: 104.4292929, Std. Dev (Farenheit)3.027728481, Count:395, Std. Error 0.152341553 CD Spree Mean: 102.8909091, Std. Dev (Farenheit)1.993948717, Count:164, Std. Error 0.155701236 Pulse Readings Prewalk Gold Mean: 79.78195489, Std. Dev (bpm): 13.34242399, Count: 133, Std. Error: 1.156934886 Prewalk Spree Mean: 80.70676692, Std. Dev (bpm): 14.95943097, Count: 133, Std. Error: 1.297147174 Walk Gold Mean: 100.6028571, Std. Dev (bpm): 21.38310644, Count: 350, Std. Error: 1.142975117 Walk Spree Mean: 101.1628571, Std. Dev (bpm): 21.57506501, Count: 350, Std. Error: 1.153235734 Cooldown Gold Mean: 85.10204082, Std. Dev (bpm): 18.02461585, Count: 147, Std. Error: 1.486645259 Cooldown Spree Mean: 84.14965986, Std. Dev (bpm): 17.2873989, Count: 147, Std. Error: 1.42584063 Note: For the Pulse Readings, some data was not included from groups 5, 8, 9, 10, 11, 13, 15, 26, 29, and 31 due to partially complete or incorrectly entered data. If one value (for example, Spree) was incorrectly entered or missing, its corresponding (Gold Standard) value was omitted. Graph Inferential Statistics Because the experiment compared only two data sets (the gold standard and the Spree device), a t-test was used. The t-test itself was uncoupled because the data sets were not directly sequential to each other. In other words, there were no (before-and-after measurements). Pulse Overall T Test: 0.909374538 Pulse Overall Pearson's Correlation: 0.805209108 Temperature Overall T Test: 0.0 Temperature Overall Pearson's Correlation: 0.028772406 Since the Temperature T-Test produced a result that was less than 0.05, we conclude that there is a statistically significant difference between the Gold Standard and Spree measurements. That isn't good for the Spree because if it were a good and accurate device, then it would yield results similar to the Gold Standard and thus there would be no significant difference between the two devices. Since the Pulse T-Test produced a result that was greater than 0.05, we conclude that there is no statistically significant difference between the Gold Standard and Spree measurements. That is good for the Spree, because it means it is almost on par with the Gold Standard in terms of accuracy. Because the Temperature Pearson's correlation test produced a value that was close to 0, we conclude that there is no correlation between the two sets of measurements. Because the pulse Pearson's correlation test produced a value that was close to 1, we conclude that there is positive correlation between the two sets of measurements. Summary/Discussion In the comparison between the gold standard and the Spree health monitor, there were significant differences found between the temperature measurements. These differences can be attributed to the general scale used to measure temperature, ranging only from 1 to 4. With such little accuracy, discrepancies are guaranteed. This inaccuracy is exacerbated by the fact that body temperature is inaccurately measured on the surface. External temperature is often swayed by outside sources of heat, while internal temperature can be more accurately measured through oral or rectal exams, such as the mouth thermometer used as the gold standard in this experiment. The Spree exam, in order to improve accuracy in measuring temperature, should adopt a more detailed scale than the current 1-4 scale. Also, to improve accuracy, making the device more compact and able to fit within the mouth would allow for more accurate readings. However, this would inconvenience the user, so another method may be necessary. However, the current level of uncertainty is unacceptable in a final product. As for errors in heart rate measurements, there was no significant difference between the pulse ox and the Spree device. However, measurements were sporadic, with the device often unavailable when the timer sounded. As a result, there is enormous room for inaccuracies due to uneven measuring intervals, which could result in understating high heart rate measurements or overstating low heart rate measurements. This would also undermine consumer utility; if the device itself is unable to establish a connection when it is needed, much of its usefulness is diminished. In order to address this, the technology itself must be improved. The application should be able to maintain a consistent connection with any nearby device and display constant measurements. In this way, while measurements may be accurate to a certain degree compared to the gold standard, they will also be consistent and readily available. Finally, the physical design of the device itself was clunky and inconvenient. The test subject often readjusted the device, feeling uncomfortable due to the lack of a size-adjusting strap. Also, matted hair would block the device itself, causing discrepancy in the data. Positioning of the band would influence the readings and the reception to the application. All of these are disadvantages of using a headband as the final product. In order to create a more practical design, placement in a less conspicuous location may be in order, such as the wrist or around the waist. Altogether, the Spree monitoring device possesses many design errors and provides inaccurate measurements. A reform of the design is necessary, and will be the only way that a convenient, pragmatic, and effective device can be manufactured. LAB 3B WRITE-UP Target Population and Need The perfect target population to test out this device is around 100-200 people. This is a very good number of candidates to test this device because we cab get a good idea of how this device works on different individuals(diet,health history,etc.) Device Design The Spree Band is a new innovation on fitness monitors.This is the only activity tracker in a headband form and is designed to give immediate workout feedback(heart rate, temperature, distance, speed, time,and calories burned). This device is set at a very hefty price tag of $200. The design's main flaw is that some may feel dizzy due to the tight headband. One main suggestion to improve this device is to integrate different parts of the head band to have an even ratio instead of having a big chip appearing on an individual's forehead. Inferential Statistics Graph