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,
Jackson County Health Department,
Michigan 1989-2022
19891,070  223  208.4471  440.2376  351.4
1990313  74  236.4134  428.1105  335.5
1991248  68  274.297  391.183  334.7
1992102  15  147.152  509.835  343.1
19931,168  212  181.5570  488.0386  330.5
19941,091  172  157.7518  474.8401  367.6
19951,074  171  159.2491  457.2412  383.6
19961,028  166  161.5467  454.3395  384.2
19971,116  198  177.4484  433.7434  388.9
19981,098  175  159.4492  448.1431  392.5
19991,028  158  153.7434  422.2436  424.1
20001,043  148  141.9418  400.8477  457.3
20011,117  162  145.0501  448.5454  406.4
20021,152  183  158.9542  470.5427  370.7
20031,129  189  167.4501  443.8439  388.8
20041,231  234  190.1498  404.5499  405.4
20051,145  199  173.8527  460.3419  365.9
20061,106  236  213.4475  429.5395  357.1
20071,157  224  193.6493  426.1440  380.3
20081,134  217  191.4498  439.2419  369.5
20091,018  189  185.7444  436.1385  378.2
20101,008  175  173.6450  446.4383  380.0
2011986  174  176.5434  440.2378  383.4
2012922  176  190.9391  424.1355  385.0
2013915  154  168.3412  450.3349  381.4
2014986  207  209.9403  408.7376  381.3
2015921  159  172.6406  440.8356  386.5
2016937  189  201.7412  439.7336  358.6
2017947  171  180.6419  442.4357  377.0
2018969  170  175.4435  448.9364  375.6
2019933  154  165.1399  427.7380  407.3
20201,019  196  192.3433  424.9390  382.7
2021983  186  189.2468  476.1329  334.7
2022930  172  184.9454  488.2304  326.9
        

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;1990-2022 Geocoded Michigan Birth Certificate Registries.
Division for Vital Records & Health Statistics, Michigan Department of Health & Human Services