Age-Period-Cohort Analysis of 1990–2003 Incidence Time Trends of Childhood Diabetes in Italy

TABLE 3

Comparison of different age-period-cohort models fitted to incidence rates of type 1 diabetes among Italian children 0–14 years old in the years 1990–2003

Covariates included in the model DF Likelihood ratio χ2 P α*
1. Sex
2. Sex + age 4 385.00 <0.0001 0.21
3. Sex + age + drift 1 65.33 <0.0001 0.20
4. Sex + age + cohort 7 8.51 0.29 0.20
5. Sex + age + period + cohort 3 2.23 0.53 0.20
6. Sex + age + period −7 −6.51 0.48 0.20
3. Sex + age + drift −3 −4.24 0.24 0.20
  • Each model is compared with the one above through the likelihood ratio test.

  • *Likelihood-ratio test of α = 0; P < 0.001 in all models. DF, difference in the number of degrees of freedom.

This Article

  1. Diabetes vol. 59 no. 9 2281-2287