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Table 3 Prevalence and odds ratio for clinical mastitis in each stage of production

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

   0–60 days 61–120 days 121–180 days ≥181 days
  N Mean Odd ratio (95%CIa) Mean Odd ratio (95%CIa) Mean Odd ratio (95%CIa) Mean Odd ratio (95%CIa)
Parity
 1 2025 7.3 Reference 2.9 Reference 2.8 Reference 4.0 Reference
 2 2565 9.4 1.33 (1.07–1.65) 6.5 2.46 (1.81–3.34) 3.9 1.53 (1.09–2.14) 7.6 1.97 (1.51–2.58)
 3 2163 12.2 1.72 (1.38–2.13) 7.3 2.81 (2.06–3.84) 5.1 2.01 (1.44–2.81) 8.6 2.07 (1.57–2.72)
 4 1370 12.6 1.78 (1.40–2.26) 5.4 2.05 (1.43–2.93) 5.9 2.41 (1.68–3.45) 8.0 1.87 (1.38–2.54)
  ≥ 5 1540 14.3 2.12 (1.68–2.66) 5.8 2.27 (1.61–3.21) 4.3 1.73 (1.19–2.52) 8.5 2.00 (1.48–2.70)
Calving seasonc
 Spring 2179 8.7 NSb 5.8 NSb 5.5 NSb 6.7 0.70 (0.56–0.87)
 Summer 2445 14.0 1.64 (1.37–1.97) 5.8 3.2 0.66 (0.49–0.88) 4.7 0.46 (0.37–0.59)
 Autumn 2619 11.1 1.26 (1.05–1.52) 5.1 3.6 0.74 (0.56–0.97) 8.0 0.81 (0.67–0.99)
 Winter 2420 9.2 Reference 6.0 4.9 Reference 9.6 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)