Table 2.

Joinpoint analyses of trends in mortality rates of sudden infant death syndrome (SIDS) and related diagnostic groups

Diagnostic group		Time periods defined by joinpoint regression
SIDS	Period	1968–1971	1971–1974	1974–1979	1979–1991	1991–2001	2001–2009
	APC (95% CI)	26.5 (20.7, 32.5)*	47.3 (34.2, 61.7)*	3.3 (0.2, 6.3)*	−1.2 (−1.8, −0.6)*	−8.3 (−9.1, −7.5)*	−0.1 (−1.1, 1.0)
Symptoms, signs and ill-defined conditions	Period	1968–1971	1971–1975	1975–1991	1991–1998	1998–2009
	APC (95% CI)	6.6 (2.7, 10.7)*	13.5 (9.3, 17.8)*	−0.4 (−0.7, −0.1)*	−7.8 (−9.0, −6.6)*	−0.8 (−1.3, −0.3)*
Symptoms, signs and ill-defined conditions plus unintentional suffocation	Period	1968–1970	1970–1975	1975–1991	1991–1998	1998–2009
	APC (95% CI)	−0.6 (−8.0, 7.5)	7.7 (5.1, 10.4)*	−0.7 (−1.0, −0.3)*	−7.0 (−8.2, −5.8)*	0.5 (−0.0, 1.0)
Symptoms, signs and ill-defined conditions, unintentional suffocation plus respiratory diseases	Period	1968–1970	1970–1982	1982–1991	1991–1998	1998–2009
	APC (95% CI)	−7.8 (−13.3, −1.9)*	−3.8 (−4.2, −3.4)*	−0.8 (−1.5, −0.2)*	−6.9 (−7.9, −5.9)*	0.1 (−0.4, 0.5)

APC, annual percentage change (the number of periods was defined by the joinpoints that were derived from the best-fit models); CI, confidence interval.

^*APC significantly different from 0 (P < 0.05).