Table 1.
Sample size by cohort and wave.
| Cohort | Wave 1 (20’s) | Wave 2 (30’s) | Wave 3 (40’s) | Wave 4 (50’s) | Wave 5 (60’s) |
|---|---|---|---|---|---|
| Mage = 20.01, SD = .63, range = 17–24 years | Mage = 30.96, SD = .63, range = 28–38 years | Mage = 42.77, SD = 1.62, range = 40–58 years | Mage = 55.69, SD = 1.61, range = 52–60 years | Mage = 67.68, SD = 1.32, range = 64–71 years | |
| 1 | 1965–1968 N = 348 |
1976–1977 N = 153 |
1988–1989 N = 99 |
2000–2002 N = 182 |
2012–2014 N = 163 |
| 2 | 1976–1977 N = 299 |
1988–1989 N = 83 |
2000–2002 N = 137 |
2012–2014 N = 114 |
- |
| 3 | 1988–1989 N = 292 |
2000–2002 N = 114 |
2012–2014 N = 102 |
- | - |
| 4 | 2000–2002 N = 285 |
2012–2014 N = 101 |
- | - | - |
Note. Mage = mean age, SD = standard deviation. The discrepancy in sample sizes between the 1988–1989 and the 2000–2002 assessments is a result of major efforts to re-engage participants from Cohorts 1 and 2 in the early 2000’s, facilitated by the emergence of the internet. Further detail on these efforts is reported in Whitbourne et al. (2009). Although the age range for Wave 3 includes participants with ages 40–58, only two participants had an age reported outside of the intended 40–49 age range. One participants’ age is reported as 55, another’s is 58. All other remaining participants’ ages fell within the range of 40–48. Sensitivity analyses excluding these two participants are reported in Supplemental Table S8, and had no substantive differences from the main results.