Figure 12.1.8: Preterm births by mother’s age group
Rate per 100 live births, Middlesex-London, Ontario and Peer Group, 2013 to 2017 average
Preterm birth rates in Middlesex-London, Ontario and the Peer Group were highest for mothers age 45 to 49 and lowest for mothers age 25 to 29 between 2013 to 2017. The margin of error (95% confidence interval) is higher for some age groups—particularly among mothers age 45 to 49—due to the small number of women who gave birth in those age groups.
For Ontario, the preterm birth rate among mothers age 45 to 49 was significantly higher than other maternal age groups. For Middlesex-London, the differences across age groups are not statistically significant due to the small number of women in some of the age groups (i.e., 15 to 19, 40 to 44, 45 to 49).