Results of GMM for clustering the trend of injured rates for all provinces
| Parameter | Class 1* | Class 2† | Class 3‡ | Class 4§ |
| N (%) | 14 (45.2) | 3 (9.7) | 8 (25.8) | 6 (19.3) |
| Intercept | 1.09*** | 0.48*** | 0.95*** | 1.01*** |
| Slope | −0.01*** | 0.002 | 0.03*** | 0.01*** |
| Time Scores | (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) | (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) | (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) | (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) |
*** is significant at <0.001.
*Bushehr, Chaharmahal and Bakhtiari, Fars, Gilan, Golestan, Ilam, Kermanshah, Kurdistan, Kohgiluyeh and Boyer-Ahmad, Khuzestan, Markazi, Tehran, West Azerbaijan, Yazd.
†Hormozgan, Kerman, Sistan and Baluchistan.
‡East Azerbaijan, Isfahan, North Khorasan, Qazvin, Qom, Razavi Khorasan, Semnan, Zanjan.
§Alborz, Ardabil, Hamadan, Lorestan, Mazandaran, South Khorasan.
GMMs, growth mixture models.