Mortality rates from SIDS, non-SIDS, and composites of diagnoses potentially reallocated from SIDS, over the 30-year period. Composites are Unknown Composite, Circumstantial Respiratory Composite, External Causes Composite, and CUID Composite. A, Comparative trends of SIDS and non-SIDS mortality. The vertical gray line demarcates the beginning of a plateau in postneonatal mortality. B, Comparative trends in diagnostic composites. The red arrows denote inflection points of increase in mortality in postneonatal composites. The green arrow denotes the beginning of the plateau in mortality for the CUID Composite.
Comparison of actual and projected rates if SIDS followed trends of non-SIDS mortality. Black vertical lines illustrate the years of sustained excess mortality reductions beyond those projected. A, SIDS-based projection. B, CUID-based projection.
Bland–Altman analysis of concordance between actual and projected CUID rates, a consistently applied measure of SIDS mortality over the 30-year period. The confidence interval reflects agreement between the projected and the actual rates, showing high concordance when the average distance is close to zero, the confidence interval is narrow, and differences between projected and actual fall within the confidence interval. Circles denote years within the confidence interval. Triangles denote the years when actual reductions in CUID exceeded the confidence interval. The average difference between the projected and actual CUID rates was 0.01 cases per 1000.
Cluster analysis comparing mortality trends in leading causes of postneonatal mortality. A, SIDS and accidents are plotted separately because the scale of their mortality eliminates the ability to see definition in other causes when the y-axis is accommodated to them. The semitransparent blue box contains years of excess mortality reductions when BTS was first promoted. B, The diagnoses clustering with SIDS rates. C, Other leading causes of postneonatal mortality.
Birth weight–specific mortality trends for LBW and projected birth weight–specific mortality based on non-SIDS mortality trends. A, In 1983, there were 20 580 extremely low birth weight (ELBW) live born infants linked to 38 ELBW-associated SIDS deaths. In 2012, there were 28 275 ELBW live born infants linked to 18 ELBW-associated SIDS deaths. B, In 1983 there were 20 696 very low birth weight (VLBW) births and 136 VLBW-associated SIDS deaths; in 2012 there were 28 993 VLBW births and 43 VLBW-associated SIDS deaths. C, In 1983 there were 186 798 LBW births and 772 LBW-associated SIDS deaths; in 2012, there were 259 782 LBW births and 246 LBW-associated SIDS deaths.