Table 1.
How great is the risk? | ||
---|---|---|
Pregnancy in adolescence | + | Increased prevalence of anemia, pregnancy-induced hypertension, low birthweight, prematurity, intra-uterine growth retardation and neonatal mortality |
Birth spacing | + | |
Short intervals | PTb: OR 1.45, LBW: OR 1.65 | |
Long intervals | PTb: OR 1.21, LBW: OR 1.37 | |
Pre-pregnancy weight status | + | |
Underweight | PTb: OR 1.32, LBW: OR 1.64 | |
Overweight & obesity | PTb: OR 1.07 | |
Maternal overweight is a risk factor for many pregnancy complications including hypertensive disorders, gestational diabetes, postpartum hemorrhage, stillbirth, congenital disorders Both underweight and overweight women have a higher chance for requiring obstetric intervention at delivery |
||
Micronutrient deficiencies | +/- | |
Folic acid | Folic acid deficiency is definitively linked to neural tube defects (NTDs) in newborns | |
Iron | Anemia increases the risk for maternal mortality, low birthweight, preterm birth and child mortality | |
Chronic diseases | + | |
Diabetes mellitus | Babies born to women with diabetes before conception have a much higher risk of stillbirths, perinatal mortality, congenital disorders, as well as spontaneous pregnancy loss, preterm labor, hypertensive disorders, and delivery by cesarean birth. | |
Hypertension | ||
Anemia | A study shows that anemia before conception increases the risk of low birthweight (OR 6.5) | |
Poor mental health (especially depression) and Intimate partner violence | ++ | Increased risk for preterm birth, low birthweight and depression during pregnancy and the postpartum period IPV-PTb OR 1.37, LBW OR: 1.17 Also increased risk for spontaneous pregnancy loss, stillbirth, gynecological problems including sexually-transmitted infections, depression |
Infectious diseases | ++ | |
STIs - syphilis | Infectious diseases increase the risk for spontaneous pregnancy loss, stillbirths and congenital infection | |
HIV/AIDS | ||
Rubella | ||
Tobacco use | ++ | A single study shows risk PTb OR: 2.2 Smoking increases the risk for spontaneous pregnancy loss, placental disorders, congenital malformations, sudden infant death syndrome, stillbirths and low birth weight |
For magnitude of risk:
++ means strong evidence of risk and implicated in biological pathways leading to preterm birth and low birthweight
+ means moderate evidence of risk on preterm birth and low birthweight
+/- means weak evidence of risk on preterm birth and low birthweight
Acroynms used: PTb = preterm birth; OR = odds ratio; IPV = intimate partner violence
Source: Barros et al., 2010; Bhutta et al., 2011a; Goldenberg et al., 2008; Iams et al., 2008