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Table 4 Comparison of distributions of unusable and usable monthly volume and SCC records - annually and monthly

From: The impact of removal of the seasonality formula on the eligibility of Irish herds to supply raw milk for processing of dairy products

Period SCC Monthly volume
Number of unusable recordsa Number of usable recordsa p-valueb Number of unusable recordsa Number of usable recordsa p-valueb
Annual 102810 71815 <0.001 103391 73245 <0.001
Monthly
 January 4237 4157 <0.001 4366 4169 <0.001
 February 8391 5822 <0.001 8445 5838 <0.001
 March 9426 6386 <0.001 9462 6400 <0.001
 April 9641 6469 0.002 9665 6478 <0.001
 May 9684 6307 0.007 9711 6487 <0.001
 June 9673 6318 <0.001 9707 6487 <0.001
 July 9665 6300 <0.001 9687 6459 <0.001
 August 9638 6284 <0.001 9682 6468 <0.001
 September 9615 6321 <0.001 9641 6476 <0.001
 October 9630 6307 0.005 9662 6469 0.003
 November 8845 6222 <0.001 8931 6405 <0.001
 December 4365 4922 0.009 4432 5109 <0.001
  1. aRecords with or without a national herd identifier were termed usable or unusable data, respectively
  2. bA p-value of <0.05 indicates there is no evidence to suggest the distribution of the usable and all records are the same