. 2010 Apr 14;52(1):24. doi: 10.1186/1751-0147-52-24

Table 1.

Mean number of calcified discs, visible on radiographic examination (CDVR), number of dogs having 4 or less and 5 and more CDVR and dogs having CDVR at surgery site in 100 surgeries for disc extrusion in different age groups.

	≤ 4 years	Age groups 5-7 years	≥ 8 years
Nr of dogs in groups	27	53	20
Mean nr of CDVR ± SD	5.74 ± 3.24^a	5.17 ± 3.83^a	2.4 ± 3.42^b
Nr of dogs with ≤ 4 CDVR	10 (37%)	27 (51%)	16 (80%)
Nr of dogs with ≥ 5 CDVR	17 (63%)	26 (49%)	4 (20%)
CDVR at surgery site	14 (52%)^ab	35 (66%)^b	5 (25%)^a

^{a, b}different superscript letters indicate statistically significant (p < 0.05) difference between age groups within row