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Table 1 Distribution of births by risk factor across 194 national household surveys

From: Changes in the distribution of high-risk births associated with changes in contraceptive prevalence

Risk Factor Mean Median Range
Not in any risk category 25% 25% 9-43%
First birth to mothers age 18-34 19% 17% 8-52%
Mother’s age < 18 6% 6% 0.5-17%
Mother’s age > 34 1% 1% 0.1-6%
Birth interval < 24 8% 7% 3-19%
Birth order > 3 20% 21% 1-33%
Mother’s age <18 and birth interval < 24 months 0.6% 0.5% 0-2.2%
Mother’s age > 34 and birth interval < 24 months 0.1% 0.1% 0-0.6%
Mother’s age > 34 and birth order > 3 10% 10% 1-18%
Mother’s age > 34 and birth interval < 24 months and birth order > 3 2% 2% 0-6.5%
Birth interval < 24 months and birth order > 3 7% 6% 1-20%