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Table 2 Relative frequency distributions (%) of weaning-to-first-mating interval (WMI) in parity 1 sows (144,052 records) and parity 2 or higher sows (547,224 records) categorized in six WMI groupsa

From: Recurrence patterns and lifetime performance of parity 1 sows in breeding herds with different weaning-to-first-mating intervals

WMI groups (days) Parity 1 Parity 2 or higher Chi-square test
n % n %
0–3 5909 4.1 46,431 8.5 P <  0.05
4 43,178 30.0 243,114 44.4  
5 55,378 38.4 179,095 32.7  
6 11,377 7.9 24,506 4.5  
7–20 18,219 12.7 39,944 7.3  
21 or more 9991 6.9 14,134 2.6  
  1. aFrequency within a column totals 100%