Fig. 4.

Annual rates of small-for-gestational-age (SGA) and low birthweight (<2500 g) among singleton livebirths with (A) Aboriginal and (B) non-Aboriginal mothers between 1987 and 2016. Shaded areas are 95% confidence intervals. All trends p<0 · 001, except low birthweight in panel A (p = 0 · 793). Point estimates for trends, as odds ratios per 10 years (95% confidence interval), were: 0 · 78 (0 · 76–0 · 80) for SGA and 1 · 00 (0 · 97–1 · 04) for low birthweight among Aboriginal births; and 0 · 76 (0 · 74–0 · 78) for SGA and 0 · 91 (0 · 87–0 · 95) for low birthweight among non-Aboriginal births. Mean total number of singleton livebirths per annum for Aboriginal and non-Aboriginal mothers, respectively, were 1161 and 2089 for the first decade, 1324 and 2189 for the second decade, and 1352 and 2464 in the third decade.