Text book: Essentials of Biostatistics in Public Health 3 ed. byLisa Sullivan.
Instructor provided problem: An observational study is conductedto compare experiences of men and women between the ages of 50-59years following coronary artery bypass surgery. Participantsundergo the surgery and are followed until the time of death, untilthey are lost to follow-up or up to 30 years, whichever comesfirst. The following table details the experiences of participatingmen and women. The data below are years of death or years of lastcontact for men and women. Estimate the Estimate the survivalfunctions for each treatment group using the Kaplan-Meier approach.Test if there is a significant difference in survival betweentreatment groups using the log rank test and a 5% level ofsignificance.
Men | | Women |
Year of Death | Year of Last Contact | | Year of Death | Year of Last Contact |
5 | 8 | | 19 | 4 |
12 | 17 | | 20 | 9 |
14 | 24 | | 21 | 14 |
23 | 26 | | 24 | 15 |
29 | 26 | | | 17 |
| 27 | | | 19 |
| 29 | | | 21 |
| 30 | | | 22 |
| 30 | | | 24 |
| 30 | | | 25 |
| | | | 30 |
