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Table 3 Multivariable model for mortality including DN/SN, year and parity with random sow effect, during the period 2013–2015 (N = 2,039)

From: The effect of double nursing, an alternative nursing strategy for the hyper-prolific sow herd, on herd performance

Factor Category IRR 95% CI Count
Nursing type SN reference   1,791
DN 0.66 0.57–0.76 248
Year of weaning 2013 reference   638
2014 1.22 1.08 –1.37 784
2015 1.13 1.0 −1.29 617
Parity 2 reference   442
3 0.89 0.77 – 1.02 424
4 0.94 0.81–1.09 378
5 0.97 0.83 –1.13 325
6 0.83 0.70 – 0.98 283
7 0.72 0.58–0.88 187