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Table 1 Median somatic cell count (× 103 cells/mL) for two herds (A, B) and for two pre-milking teat disinfection treatments (PTD: that received pre-milking teat disinfectant and NPTD: did not receive disinfectant) at five sampling dates during lactation

From: Effect of pre-milking teat disinfection on new mastitis infection rates of dairy cows

Herd A (n = 97) B (n = 167) p-value
161 (127–205) 169 (144–198) 0.54
Treatment PDT NPDT
169 (144–198) 170 (145–199) 0.93
Herd A   B  
Sample day PTD NPTD p-value PTD NPTD p-value
1-post- calving 98 (68–141) 125 (87–180) 0.98 352 (272–456) 409 (316–530) 0.99
2-May 34 (23–50) 31 (21–46) 1.00 75 (58–97) 80 (62–104) 1.00
3-July 156 (109–223) 119 (83–171) 0.97 120 (93–156) 134 (104–174) 0.99
4-August 231 (160–333) 279 (194–402) 0.99 134 (103–173) 115 (88–148) 0.99
5-October 1300 (905–1877) 1411 (981–2025) 1.00 301 (230–392) 246 (189–321) 0.96
  1. () parentheses represent a 95% confidence interval
  2. Total observations across sample dates = 5075