Table 3.

Age distribution of the 1964 participants at the time of the questionnaire

Age at study (years)	Number of animals	Number of Cases
0	172	1
1	295	0
2	263	4
3	207	14
4	187	15
5	184	34
6	176	53
7	140	51
8	91	39
9	88	37
> = 10	161	65
	Total number of animals: 1964	Total number of IVDH Cases: 313