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Table 1 Results of univariable analyses (continuous variables), tested for associations with type of herd (high mortality/low mortality)

From: α-Tocopherol and β-carotene concentrations in feed, colostrum, cow and calf serum in Swedish dairy herds with high or low calf mortality

Model/variable High mortality Low mortality P valuea
25 pct. Median 75 pct. 25 pct. Median 75 pct.
Model feedb (n = 57)
 Herd size 2008/09 154 175 222 141 151 170 0.28
 % Grass silage of total diet 27 37 42 29 41 60 0.45
Model colostrumb (n = 162)
 Fatc (%) 3.44 4.95 7.30 2.65 3.82 6.56 0.10
 Herd size 2008/09 154 175 222 141 151 170 0.34
 Total solids (Brix%) 21.2 23.4 26.1 19.9 22.4 25.1 0.20
Model cow (n = 189)
 Herd size 2008/09 154 175 222 141 151 170 0.28
 % Grass silage of total diet 27 37 42 29 41 60 0.45
Model calfb
 Herd size 2008/09 154 175 222 141 151 170 0.28
 Median herd level concentration of vitamin (α-tocopherol/β-carotene) in colostrum (µg/mL) 0.59/0.07 0.90/0.11 1.19/0.17 0.72/0.08 1.07/0.15 1.44/0.20 0.030/0.18
  1. aTested with univariable logistic regression, with cluster on herd, of its association with type of herd (high mortality/low mortality)
  2. bOutcome transformed with a natural logarithm (ln) to approximate normal distribution
  3. cFive missing values