Is teenage pregnancy an obstetric risk in a welfare society? A population-based study in Finland, from 2006 to 2011.

BMJ Open · 2013 · PMC3753503 · PMID 23959755

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an increasing trendno p-value reported

42 43 A report by the National Center for Health Statistics in the USA showed an increasing trend in frequency with descending age (0.6% in 10-year-olds to 14-year-olds and 0.3% among 25-year-olds to 29-year -olds). 13 Owing to a smaller number of cases and rarity of the condition, we could not evaluate such a trend.

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