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Table 2 Prevalence and odds ratio by parity or calving season

From: Epidemiological study to investigate the incidence and prevalence of clinical mastitis, peracute mastitis, metabolic disorders and peripartum disorders, on a dairy farm in a temperate zone in Japan

   Clinical mastitis Peracute mastitis Metabolic disorder Peripartum disorder
  N Mean Odd ratio (95%CIa) Mean Odd ratio (95%CIa) Mean Odd ratio (95%CIa) Mean Odd ratio (95%CIa)
Parity
 1 2025 17.0 Reference 4.2 Reference 1.7 Reference 3.3 Reference
 2 2565 27.4 1.94 (1.67–2.24) 11.7 3.11 (2.43–4.00) 2.2 NSb 3.4 NSb
 3 2163 33.1 2.44 (2.09–2.83) 16.5 4.65 (3.63–5.96) 4.6 3.32 (2.23–4.94) 5.3 1.46 (1.06–2.01)
 4 1370 31.9 2.29 (1.93–2.70) 18.0 5.19 (4.00–6.74) 5.0 3.86 (2.53–5.88) 4.2 NSb
  ≥ 5 1540 33.0 2.46 (2.08–2.89) 19.3 5.69 (4.40–7.35) 6.7 5.67 (3.79–8.48) 4.2 NSb
Calving seasonc
 Spring 2179 26.7 NSb 12.1 NSb 3.5 1.55 (1.10–2.18) 2.9 NSb
 Summer 2445 27.6 12.5 0.79 (0.67–0.94) 5.1 2.12 (1.55–2.88) 5.3 1.52 (1.15–2.01)
 Autumn 2619 27.8 12.8 0.79 (0.67–0.93) 3.7 1.46 (1.06–2.02) 4.2 NSb
 Winter 2420 29.7 15.7 Reference 2.7 Reference 3.5 Reference
  1. a 95% CI: 95% confidence interval
  2. b NS: Not Significant
  3. c Calving season: Spring (March–May), Summer (June–August), Autumn (September–November), and Winter (December–February)