investigating the relationship between infertility and abortions.
Format
A data frame with 248 observations and 8 variables:
- education
Education level (0 = 0–5 years, 1 = 6–11 years, 2 = 12+ years)
- age
Age in years
- parity
Number of prior pregnancies
- induced
Number of induced abortions
- case
Infertility case status (1 = case, 0 = control)
- spontaneous
Number of spontaneous abortions
- stratum
Matched set ID
- pooled.stratum
Pooled stratum ID used for conditional regression