{"locations":[{"code":"USA","name":"United States","page":"https://macroscope.is/en/country/united-states/"}],"indicators":[{"id":"first_birth_by_26","title":"First child by age 26","unit":"% of women; year = birth year of women"}],"from_year":1950,"to_year":2100,"sections":[{"id":"dyn","title":"How the indicators changed","items":[{"kind":"dynamics","indicators":["first_birth_by_26"],"text":"First child by age 26: 61.4% in 1950 → 30.8% in 1997 (−31 pp). The trend broke around 1961 and 1980: −0.72 → −0.03 → −1.1 a year.","data":{"indicator":"first_birth_by_26","from":1950,"to":1997,"first":61.4,"last":30.8,"breaks":[{"year":1961,"slope_before":-0.724,"slope_after":-0.0316},{"year":1980,"slope_before":-0.0316,"slope_after":-1.14}]}}]}],"caveat":"Moving together in time does not prove a cause: incomes, cities, education and the era itself act on many indicators at once. These observations suggest where to look, not what causes what.","view_url":"https://macroscope.is/en/chart/?c=USA&i=first_birth_by_26&from=1950&to=2100&past=1","how_to_read":"text: a ready sentence with numbers; data: the same numbers for calculations. The first indicator is the focus the others are compared with. Relationships are checked in levels (r) and in year-to-year changes (r_changes: the changes have their own linear trend removed; significance corrected for autocorrelation); lag is the shift at which changes line up best. UN errors: actual / projected − 1 for population, births and fertility, actual − projected for migration, life expectancy and mothers' age; IMF: actual − forecast. view_url opens the same view on the site."}