METHODS
Participants
One hundred and sixty-one women aged between
18 and 29 years, who lived in Bangkok, Thailand,
were recruited in this study. They were randomly
divided, using computer generated random numbers,
into two groups: a validation group of 121 women to
construct prediction equations and a cross-validation
group of 40 women for testing external validity of the
proposed equations. The number of participants of the
validation was three times that of the cross-validation
group to get enough sample size for construction of a
valid regression equation.
All participants were in good health based on
their medical history and physical examinations. They
neither smoke nor took any medicine during the period
of the study. Informed consents were signed by all
participants and the study protocol was approved by
Mahidol University Institutional Review Board (protocol
281/1999, approved on February 12th, 1999).
The research was conducted in accordance with the
principles set forth in the Helsinki Declaration.
METHODS
Participants
One hundred and sixty-one women aged between
18 and 29 years, who lived in Bangkok, Thailand,
were recruited in this study. They were randomly
divided, using computer generated random numbers,
into two groups: a validation group of 121 women to
construct prediction equations and a cross-validation
group of 40 women for testing external validity of the
proposed equations. The number of participants of the
validation was three times that of the cross-validation
group to get enough sample size for construction of a
valid regression equation.
All participants were in good health based on
their medical history and physical examinations. They
neither smoke nor took any medicine during the period
of the study. Informed consents were signed by all
participants and the study protocol was approved by
Mahidol University Institutional Review Board (protocol
281/1999, approved on February 12th, 1999).
The research was conducted in accordance with the
principles set forth in the Helsinki Declaration.
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