METHODS

Design:

subgroup analysis of a randomised controlled trial.

Allocation:

{concealed*}†.

Blinding:

blinded {data collectors, healthcare providers, outcome assessors, and all data analysts}†.*

Follow up period:

6 months.

Setting:

4 clinics in the San Francisco Bay Area, California, USA.

Participants:

from a larger trial of 2117 women, 964 adolescents who were 15–19 years of age (mean age 17 y); were not pregnant and did not wish to become pregnant; and were using oral contraceptives, condoms, other barriers, or no contraceptive methods. Exclusion criteria: request for EC or unprotected intercourse in the previous 3 days.

Intervention:

pharmacy access to EC (n = 372), advance provision of 3 packs of levonorgestrel (Plan B) EC (n = 379), and clinic access (n = 142).

Outcomes:

contraceptive behaviours, STDs, and pregnancy.

Patient follow up:

93% …