Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Summary statistics for follow-up time and covariates, 1989–1991 Iowa SEER breast cancer data.
| continuous variables | mean | std deviation | |
|---|---|---|---|
| follow-up time (months) | 110.3 | 57.2 | |
| age (years) | 65.3 | 14.7 | |
| categorical variables | level | count | proportion (%) |
| status | event | 3156 | 54.5 |
| censored | 2630 | 45.5 | |
| stage | local | 3618 | 62.5 |
| regional | 1813 | 31.3 | |
| distant | 355 | 6.1 | |
