Table 2. The j Joinpoint Regression Model Output for the Incidence Rate Trend Analysis of Deciduous Teeth Caries in Three Locations between 1990 and 2021 Based on the Global Burden of Disease Database .
| Segments | Global | North Africa and Middle East | Iran | |||
| Time interval | APC (95% CI) | Time interval | APC (95% CI) | Time interval | APC (95% CI) | |
| Trend 1 | 1990-2000 | -0.163* (-0.20, -0.12) | 1990-2000 | -0.252* (-0.32, -0.18) | 1990-1994 | -0.440* (-0.47, -0.41) |
| Trend 2 | 2000-2010 | -0.504* (-0.56, -0.46) | 2000-2010 | -1.684* (-1.74, -1.63) | 1994-2006 | -0.012 (-0.02, 0.00) |
| Trend 3 | 2010-2019 | 0.060* (0.02, 0.12) | 2010-2021 | 0.160* (0.11, 0.21) | 2006-2015 | -0.062* (-0.10, -0.05) |
| Trend 4 | 2019-2021 | -0.760* (-1.00, -0.42) | - | - | 2015-2019 | 0.097* (0.05, 0.16) |
| Trend 5 | - | - | - | - | 2019-2021 | -0.243* (-0.32, -0.14) |
| AAPC | 1990-2021 | -0.250* (-0.26, -0.23) | 1990-2021 | -0.571* (-0.59, -0.55) | 1990-2021 | -0.083* (-0.09, -0.08) |
*Significant at 0.05 level.