Please provide feedback and let me know if my answers are correct for questions 1-5; if my answers are not correct please tell me the correct answer. I think number 1 is wrong in how I worded it so i definitely need help there. Also i am not sure if my dependent and independent variables are right in number 2. thank you!!

Link:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7844949/

Minimally invasive surgery total knee arthroplasty is less popular, but the prosthesis designed specifically for MIS provides good survival and PROMs with a minimum follow-up of 10 years

1. What is the research hypothesis or research question? (5 pts)

The rate of revision among patients who underwent minimally invasive surgery total knee arthroplasty (MIS TKA) will be greater than 10 years.

2. What are the main study variable(s)? How would you describe the variables (independent vs dependent; what level of measurement are they; are they continuous or discrete; etc)? (5 pts)

Main study variables include the participants age (0-100; continuous, ratio level of data), gender (male or female; nominal level of date), height (continuous, ratio level of data), body mass index (continuous, ratio level of data), size of the posterior femoral cut (continuous, ratio level of data), and length of the anteroposterior femur (continuous, ratio level of data).

The dependent variable used in the Kaplan Meier survival analysis is the time interval; in this study the time interval is 2 years. See Figure 5. The dependent variable is a continuous, ratio level of data.

The independent variable used in the Kaplan Meier survival analysis is the occurrence or not of a given event; in this study the event is revision following a MIS TKA. See Figure 5. The event is a nominal level of data; ie the event either occurred or did not.

3. What statistical test was used? (5 pts)

A paired t test was performed to compare preoperative and postoperative range of motion (ROM).

A Kaplan Meier survival analysis was used to determine the cumulative rate of prosthesis survival during the study period.

4. What conclusions were made based on the results of the statistical test? (5 pts)

The paired t test supports that the ROM increased postoperatively; mean extension and flexion angles were increased from extension angle preoperatively (97) to postoperatively(12) andflexion angle preoperatively (10618) to postoperatively(12411). See Table 1.

The Kaplan Meier analysis supports that the projected rate of survival to revision was 94.7% at 12 years after MIS TKA. There was a 95% confidence interval, 0.90- 0.99. See Figure 5.

5. Provide the citation for the article in APA format. (3 pts)

Toyoda S., Kaneko T., Mochizuki Y., Hada M., Takada K., Ikegami H., & Musha Y. (2021).

Minimally invasive surgery total knee arthroplasty is less popular, but the prosthesis designed specifically for MIS provides good survival and PROMs with a minimum follow-up of 10 years. Journal of Orthopaedic Surgery and Research, 16(1), 1-9.https://doi-org.uc.idm.oclc.org/10.1186/s13018-021-02254-3