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. Author manuscript; available in PMC: 2019 Dec 17.
Published in final edited form as: J Perinatol. 2019 Jun 17;39(9):1175–1181. doi: 10.1038/s41372-019-0402-1

Table 2.

Interpregnancy interval (IPI) by race/ethnicity, California births 2007–12

Interpregnancy interval Non-Hispanic White Non-Hispanic Black
n (%)
< 6 months 16,875 (4.4) 6,612 (7.6)
6–11 months 49,736 (12.9) 10,775 (12.4)
12–17 months 66,366 (17.2) 9,749 (11.3)
18–23 months 55,756 (14.4) 8,321 (9.6)
24–29 months 41,987 (10.9) 6,866 (7.9)
30–35 months 30,323 (7.9) 5,740 (6.6)
36–47 months 39,359 (10.2) 9,378 (10.8)
48–59 months 24,207 (6.3) 6,912 (8.0)
≥ 60 months 61,310 (15.9) 22,215 (25.7)