Answer:
Attitude toward using birth control pills during the two-year period.
Step-by-step explanation:
Researchers (Davidson & Jaccard, 1979) discovered that the best way predict whether women were using the birth control pill two years after reporting their attitudes was the women's Attitude toward using birth control pills during the two-year period.
Researchers (Davidson & Jaccard, 1979) carried out a study which deals with the attitudes and behaviors in respect of birth control. This was carried out by measuring the attitudes of two hundred and fourth four women towards controlling of birth, birth control pills, usage of birth control pills and using of birth control pills in the next two years.