Table 4 Prevalence of the combined list from the 10 most common disorders recorded at a fine-level of diagnostic precision within each of three age bands (under 2 years, 2–7 years, over 7 years) in Chihuahuas under primary veterinary care at UK practices participating in the VetCompass™ Programme from January 1st to December 31st, 2016. The P-value reflects prevalence comparison between the three age bands using the statistical test described. Under 2 years N = 1918, 2–7 years N = 2988, over 7 years N = 664). *CI confidence interval
Fine-level disorder | <  2 yrs.: Rank | <  2 yrs.: N (%) | 2–7 yrs.: Rank | 2–7 yrs.: N (%) | >  7 yrs.: Rank | >  7 yrs.: N (%) | P-Value | Statistical Test |
|---|---|---|---|---|---|---|---|---|
Aggression | 4 | 55 (2.87) | 4 | 143 (4.79) | 5 | 33 (4.97) | 0.002 | Chi squared |
Anal sac impaction | 6 | 51 (2.66) | 3 | 178 (5.96) | 4 | 50 (7.53) | <  0.001 | Chi squared |
Anal sac infection | 29 | 10 (0.52) | 9 | 69 (2.31) | 8 | 20 (3.01) | <  0.001 | Chi squared |
Undesirable behaviour | 11 | 31 (1.62) | 10 | 47 (1.57) | 31 | 5 (0.75) | 0.246 | Chi squared |
Cryptorchidism (males only) | 2 | 76 (7.45) | 14 | 29 (2,00) | 42 | 4 (1.16) | <  0.001 | Fisher’s exact |
Diarrhoea | 7 | 34 (1.77) | 12 | 37 (1.24) | 33 | 5 (0.75) | 0.102 | Chi squared |
Gastroenteritis | 9 | 33 (1.72) | 22 | 21 (0.7) | 20 | 7 (1.05) | 0.004 | Chi squared |
Chronic cardiac disease | 259 | 0 (0) | 288 | 0 (0) | 9 | 19 (2.86) | <  0.001 | Fisher’s exact |
Heart murmur | 61 | 5 (0.26) | 16 | 27 (0.9) | 2 | 82 (12.35) | <  0.001 | Chi squared |
Obesity | 8 | 34 (1.77) | 2 | 238 (7.97) | 3 | 61 (9.19) | <  0.001 | Chi squared |
Overgrown nail(s) | 10 | 33 (1.72) | 6 | 119 (3.98) | 6 | 30 (4.52) | <  0.001 | Chi squared |
Flea infestation | 5 | 55 (2.87) | 8 | 86 (2.88) | 10 | 18 (2.71) | 0.972 | Chi squared |
Patellar luxation | 3 | 61 (3.18) | 5 | 133 (4.45) | 7 | 30 (4.52) | 0.068 | Chi squared |
Periodontal disease | 12 | 31 (1.62) | 1 | 498 (16.67) | 1 | 226 (34.04) | <  0.001 | Chi squared |
Retained deciduous dentition | 1 | 217 (11.31) | 7 | 105 (3.51) | 320 | 0 (0) | < 0.001 | Fisher’s exact |