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Table 3 Time series modeling of age-standardized first-time offense rates for heroin from 2001 to 2017 in Taiwan, separately for five age groups

From: The impact of Taiwan’s implementation of a nationwide harm reduction program in 2006 on the use of various illicit drugs: trend analysis of first-time offenders from 2001 to 2017

Parameters in the parsimonious model Coefficient estimate Standard error t‐statistic P value
Age group 18–24 years old
 Intercept (β0) 14.31 0.76 18.85  < .0001
 Baseline slope (β1) − 0.51 0.12 − 4.24 0.001
 Level change after intervention (β2) − 6.17 1.30 − 4.76 0.00
 β21 12.10    
Age group 25–29 years old
 Intercept (β0) 19.54 1.12 17.51  < .0001
 Baseline slope (β1) − 0.75 0.18 − 4.24 0.001
 Level change after intervention (β2) − 7.97 1.91 − 4.18 0.00
 β21 10.63    
Age group 30–39 years old
 Intercept (β0) 27.76 1.82 15.24  < .0001
 Baseline slope (β1) − 1.26 0.29 − 4.35 0.001
 Level change after intervention (β2) − 7.06 3.11 − 2.27 0.04
 β21 5.60    
Age group 40–49 years old
 Intercept (β0) 11.64 0.95 12.22  < .0001
 Baseline slope (β1) − 0.59 0.15 − 3.88 0.002
 Level change after intervention (β2) − 1.27 1.63 − 0.78 0.45
Age group 50–59 years old
 Intercept (β0) 2.60 0.26 10.15  < .0001
 Baseline slope (β1) − 0.14 0.04 − 3.41 0.004
 Level change after intervention (β2) 0.09 0.44 0.22 0.83