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Table 2 Joinpoint analyses of trends in mortality rates of sudden infant death syndrome (SIDS) and related diagnostic groups

From: Association between sudden infant death syndrome and diphtheria-tetanus-pertussis immunisation: an ecological study

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)  
  1. APC, annual percentage change (the number of periods was defined by the joinpoints that were derived from the best-fit models); CI, confidence interval.
  2. *APC significantly different from 0 (P < 0.05).