A birth population-based survey of preterm morbidity and mortality by gestational age

Table 1 Perinatal demographic status, prevalences and mortality rates of preterm births in Huai’an in 2015

Abbreviations: HWCH, Huai’an Women and Children’s Hospital; non-HWCH, hospitals excluding HWCH; HDP, hypertensive disorder of pregnancy; GDM, gestational diabetes mellitus; PROM, prelabor rupture of membrane; ANG, antenatal glucocorticoids; GA, gestational age; BW, birth weight; SGA, small for gestational age; AF, amniotic fluid; DR, delivery room
Values are given in n, n (%) or means + SD. Percentage (%) refers to number of preterm births in respective columns unless otherwise stated. * P < 0.05, ** P < 0.01 and *** P < 0.001 for HWCH vs. non-HWCH
1. Percentage (%) refers to the number of total births (including term and post term births) in respective columns
2. Percentage (%) refers to number of preterm livebirths excluding deaths at DR in respective columns
3. Perinatal mortality includes preterm fetal deaths / stillbirths from 25 complete gestational week till deaths within the first 7 postnatal days (including deaths at DR)
4. Neonatal mortality includes preterm deaths at DR and of livebirths within 28 postnatal days. Percentage (%) refers to number of preterm livebirths in respective columns
5. In-hospital deaths include preterm deaths of hospitalized infants until 44 week of adjusted post menstrual age (excluding deaths at DR). Percentage (%) refers to above note 2 for definition
6. All-death includes preterm fetal deaths / stillbirths and postnatal deaths from 25 complete gestational week till 44 week of adjusted post menstrual age

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