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Table 1 The number of repeated observations needed to achieve a stated margin of error for each of the indices, at their respective point of lowest coefficient of variation

From: Erratum to: Monitoring cow comfort and rumen health indices in a cubicle-housed herd with an automatic milking system: a repeated measures approach

Index Mean (%) Margin of error (%) Number of repeated observations 95 % confidence interval
Standing index 19.1 8.8 1 10.3 – 27.9
  5 3 14.1 – 24.1
  2.5 12 16.6 – 21.6
Cud chewing index 62.4 12.7 1 49.7 – 75.1
  5 6 57.4 – 67.4
  2.5 26 59.9 – 64.9
  62.4 9.4 1 53.0 – 71.8
  5 4 57.4 – 67.4
Rumination index   2.5 14 59.9 – 64.9