We considered LBW to be the primary outcome
measure since it is common and associates with various
neonatal complications. From our pilot investigation in
a separate cohort of 50 gravidas with underweight, the
rates of LBW were 8% and 23% in those with and
without adequate weight gain, respectively. The sample
size was then calculated using 5% type I error and 10%
type II error. We added 25% to the number calculated
in the event that any subject was excluded. This resulted
in total of 153 study subjects and 153 controls needed.
Data collection included maternal demographic and
antenatal characteristics, delivery information, and
adverse pregnancy outcomes. BMI was calculated from
self-reported pre-pregnancy weight (kg) divided by
square of height (m2
). Gestational weight gain during
pregnancy was defined as the weight measured on the
date of admission to the delivery ward minus
pre-pregnancy weight. Weight measurements of all
women were performed using the same weighing scales
at the antenatal clinic and delivery room. Adverse
pregnancy outcomes included LBW, SGA, birth
asphyxia, and NICU admission. LBW referred to
neonatal birth weight less than 2,500 grams(11). A
diagnosis of SGA was made when estimated fetal
weight was under the 10th percentile for that particular
GA(12). Birth asphyxia was defined as 5-minute Apgar
We considered LBW to be the primary outcomemeasure since it is common and associates with variousneonatal complications. From our pilot investigation ina separate cohort of 50 gravidas with underweight, therates of LBW were 8% and 23% in those with andwithout adequate weight gain, respectively. The samplesize was then calculated using 5% type I error and 10%type II error. We added 25% to the number calculatedin the event that any subject was excluded. This resultedin total of 153 study subjects and 153 controls needed.Data collection included maternal demographic andantenatal characteristics, delivery information, andadverse pregnancy outcomes. BMI was calculated fromself-reported pre-pregnancy weight (kg) divided bysquare of height (m2). Gestational weight gain duringpregnancy was defined as the weight measured on thedate of admission to the delivery ward minuspre-pregnancy weight. Weight measurements of allwomen were performed using the same weighing scalesat the antenatal clinic and delivery room. Adversepregnancy outcomes included LBW, SGA, birthasphyxia, and NICU admission. LBW referred toneonatal birth weight less than 2,500 grams(11). Adiagnosis of SGA was made when estimated fetalweight was under the 10th percentile for that particularGA(12). Birth asphyxia was defined as 5-minute Apgar
การแปล กรุณารอสักครู่..