As reported in San Francisco Gate:

STATEWIDE
100% of precincts reporting

Yes 3,035,043 45.9%
No 3,577,051 54.1%

Read the proposition as it appeared on the ballot:

Should the California Constitution be amended to require notification of the parent or legal guardian of an unemancipated pregnant minor at least 48 hours before performing an abortion?

Summary Prepared by the State Attorney General:
Amends California Constitution prohibiting abortion for unemancipated minor until 48 hours after physician notifies minor's parent/guardian, except in medical emergency or with parental waiver. Mandates reporting requirements. Authorizes monetary damages against physicians for violation. Put on the Ballot by Petition Signatures

Fiscal Impact from the Legislative Analyst:
Potential unknown net state costs of several million dollars annually for health and social services programs, court administration, and state health agency administration combined.

Meaning of Voting Yes/No
A YES vote on this measure means:
The State Constitution would be changed to require that a physician notify, with certain exceptions, a parent or legal guardian of a pregnant minor at least 48 hours before performing an abortion.

A NO vote on this measure means:
Minors would continue to receive abortion services to the same extent as adults. Physicians performing abortions for minors would not be subject to notification requirements.