Table 1 Sampling Matrix for in-depth interviews
From: A qualitative study of factors influencing male participation in fertility research
Secondary sample criteria | Primary sample criteria | |||
|---|---|---|---|---|
Male respondent | Male non-respondent | Female non-inviters | Total | |
Education |  ≥ 1 with less than college education and ≥ 1 with college education |  ≥ 1 with less than college education and ≥ 1 with college education |  ≥ 1 with less than college education and ≥ 1 with college education |  |
US census regions and Canada |  ≥ 2 different regions represented |  ≥ 2 different regions represented |  ≥ 2 different regions represented | At least all five represented across total sample |
Pregnancy attempt time at enrollment in PRESTO |  ≥ 1 with < 3 cycles and ≥ 1 with 3–6 cycles | 1 with < 3 cycles and ≥ 1 with 3–6 cycles | 1 with < 3 cycles and ≥ 1 with 3–6 cycles |  |
Targeted n | 3–6 | 3–6 | 3–6 | 9–18 |