YearMultiparous MothersInterpregnancy Interval
Short IPIIPI of 12-35 MonthsIPI of 36 Months and over
NumberRateNumberRateNumberRate
Number & Rate of Live Births by Interpregnancy Interval and by Year,
City Of Detroit Health Department,
Michigan 1989-2023
19898,787  2,080  236.73,254  370.33,453  393.0
19908,546  2,312  270.53,123  365.43,111  364.0
19915,846  1,708  292.22,050  350.72,088  357.2
19925,326  1,493  280.32,037  382.51,796  337.2
199311,978  3,361  280.64,678  390.53,939  328.9
199411,035  2,862  259.44,158  376.84,015  363.8
19959,505  2,132  224.33,716  391.03,657  384.7
19969,031  1,794  198.63,579  396.33,658  405.0
19979,269  1,832  197.63,457  373.03,980  429.4
19988,946  1,673  187.03,198  357.54,075  455.5
19998,594  1,583  184.23,084  358.93,927  456.9
20008,890  1,653  185.93,191  358.94,046  455.1
20018,669  1,604  185.03,125  360.53,940  454.5
20027,954  1,457  183.22,871  361.03,626  455.9
20037,806  1,419  181.82,788  357.23,599  461.1
20047,331  1,338  182.52,676  365.03,317  452.5
20057,137  1,405  196.92,483  347.93,249  455.2
20067,245  1,392  192.12,556  352.83,297  455.1
20076,379  1,264  198.22,251  352.92,864  449.0
20085,714  1,110  194.32,065  361.42,539  444.3
20095,555  1,102  198.41,904  342.82,549  458.9
20105,666  1,126  198.72,043  360.62,497  440.7
20115,689  1,150  202.11,980  348.02,559  449.8
20125,535  1,081  195.32,028  366.42,426  438.3
20135,583  1,079  193.32,024  362.52,480  444.2
20145,602  1,115  199.01,974  352.42,513  448.6
20155,902  1,160  196.52,096  355.12,646  448.3
20165,781  1,123  194.32,031  351.32,627  454.4
20175,917  1,097  185.42,134  360.72,686  453.9
20185,885  1,148  195.12,074  352.42,663  452.5
20195,825  1,147  196.92,005  344.22,673  458.9
20205,435  1,059  194.81,876  345.22,500  460.0
20214,966  900  181.21,723  347.02,343  471.8
20224,799  858  178.81,669  347.82,272  473.4
20234,226  774  183.21,427  337.72,025  479.2

Notes:

Rates are per 1,000 multiparous mothers.
Inter-pregnancy Interval (IPI) is the time in months between the date of last menstrual period of current pregnancy and the date of previous live birth among multiparous mothers. (This definition of IPI is sometimes called the "birth-to-birth interval, minus 9 months.")

Short IPI
The IPI is less than 12 months.

Source: 1989 Michigan Birth Certificate Registry;1990-2023 Geocoded Michigan Birth Certificate Registries.
Division for Vital Records & Health Statistics, Michigan Department of Health & Human Services