Figure 4.

Temporal patterns in monthly proportion of births among singleton livebirths that occurred at 20 weeks’ gestation or later by maternal characteristics, Ontario, Canada, 2006–2012. A) Women younger than 20 years of age; B) women 35 years of age or older; C) women in the highest neighborhood income quintile; D) women in the lowest neighborhood income quintile; E) women in the highest neighborhood education quintile; and F) women in the lowest neighborhood education quintile. The gray lines represent observed data; the black lines represent smoothed data.