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Table 1 Measurements to assess the status of advanced maternal age and their effect on perinatal outcomes in Arba Minch zuria, and Gacho Baba district, southern Ethiopia, 2018/9

From: Association between maternal age and adverse perinatal outcomes in Arba Minch zuria, and Gacho Baba district, southern Ethiopia: a prospective cohort study

Variables Description Measurements
Perinatal outcomes
Gestational age A period counted from the Last Normal Menstrual Period (LNMP) if the mother remembered, or based on Ultrasound result during pregnancy. Neonate’s gestational age categorized as pre-term for less than 37 weeks coded as “1”, a term for 37–42 weeks coded as “2′, and post-term 42+ weeks coded as “3″.
Size of the neonate Birth weight or size of the neonate during delivery. The size of the neonate categorized as very small coded as “1”, smaller than usual coded as “2”, about average coded as “3”, and larger than usual coded as “4”.
Stillbirth Give birth to a dead fetus after 28 weeks of gestation. Those conceptuses ended up with stillbirth coded as “1′, and the other coded as “2″.
Neonatal mortality Neonates died within 28 days of birth. Those neonates died within 28 days by the non-accident case were coded as “1”, not were coded as “2”.
Exposure variable
Advanced maternal age Defined as a pregnant mother aged ≥35 years old [17]. Categorized into two groups, and for the mother aged 20–34 years old was coded as “1” and “2” for ≥35 years.
Adjusted/confounding and some other variables
Parity Number of births that the woman have The responses categorized into two categories as primi (1st birth order) coded as “1” and multipara (2 or more birth order coded as “2”.
BMI Weight of women in kg per height square Classified into underweight
(< 18.5 kg/m2), normal (18.5–24.9 kg/m2), overweight (25–29.9 kg/m2), obese (30–34.9 kg/m2), and morbidly obese (≥35 kg/m2).
Wealth index The EDHS household assets questions used, and principal component analysis done to rank the categories. It ranked into three categories, 1st quantile coded as 1, 2nd quantile coded as “2”, and 3rd quantile coded as “3”.
Distance to the health center Approximate distance to the health center on foot which was responded by the respondent Categorized in to two: “1” = ≤2 h on foot and “2”= > 2 h (BEmOC)
Distance to the hospital Approximate distance to the hospital on foot which was responded by the respondent Categorized in to two: “1” = ≤2 h on foot and “2”= > 2 h (CEmOC)
Household food insecurity Both physical and economic access to sufficient food to meet their dietary needs for a productive and healthy life Categorized households into four levels of household food insecurity (access) based on response to nine questions of HFIAS: food secure (1) and mild (2), moderately (3), and severely food insecure (4) [31].
Districts (woreda) It is the third-level administrative divisions of Ethiopia.
Kebele (wards) Defined as the smallest administrative unit of Ethiopia, and it is a neighborhood or a localized and delimited group of people.