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Table 2 Puppy mortality in litters

From: Factors affecting reproductive performance in the Swedish Bernese mountain dog

 

Outcome

Stillbirth

Mortality of live-born puppies

Factor

Factor level

Proportion %

(n at factor level)

OR

(95% CI)

P-value

Proportion %

(n at factor level)

OR (95% CI)

P-value

Age of bitch

Age 1–2

57.0 (242)

Reference

0.81a

15.7 (242)

Reference

0.87a

Age 3

51.5 (237)

0.78 (0.51–1.20)

17.3 (237)

1.05 ( 0.59–1.85)

Age 4

48.8 (168)

0.76 (0.45–1.28)

17.9 (168)

1.28 (0.63–2.59)

Age 5

48.0 (100)

0.73 (0.36–1.45)

13.0 (100)

0.93 ( 0.36–2.40)

Age ≥ 6

43.1 (51)

0.77 (0.30–1.94)

11.8 (51)

0.73 (0.19–2.85)

Parity

Parity1

53.1 (426)

Reference

0.83a

16.2 (426)

Reference

0.48a

Parity 2

52.5 (236)

1.16 (0.76–1.79)

18.6 (236)

1.16 (0.66–2.04)

Parity 3

46.9 (98)

0.97 (0.50–1.84)

10.2 (98)

0.61 (0.24–1.56)

Parity ≥ 4

42.1 (38)

0.91 (0.34–2.47)

13.2 (38)

1.00 (0.24–4.18)

Season

Winter

48.9 (174)

Reference

0.052a

9.2 (174)

Reference

Reference

Spring

55.3 (291)

1.26 (0.83–1.92)

16.8 (291)

2.06 (1.09–3.91)

0.026

Summer

56.2 (178)

1.41 (0.88–2.24)

20.2 (178)

2.72 (1.37–5.40)

0.0041

Autumn

42.6 (155)

0.76 (0.47–1.24)

17.4 (155)

2.15 (1.06–4.37)

0.034

LSB

LSB 1–2

35.5 (107)

Reference

Reference

9.3 (107)

Reference

Reference

LSB 3–4

39.9 (163)

1.19 (0.69–2.06)

0.52

11.7 (163)

1.41 (0.59–3.34)

0.44

LSB 5–7

49.0 (257)

1.75 (1.05–2.90)

0.031

21.9 (257)

3.25 (1.46–7.20)

0.0037

LSB 8–9

66.3 (172)

3.62 (2.07–6.33)

 < 0.001

13.4 (172)

1.83 (0.76–4.42)

0.18

LSB ≥ 10

69.7 (99)

4.28 (2.62–8.10)

 < 0.001

20.2 (99)

3.00 (1.21–7.45)

0.018

CS

CS

49.4 (263)

0.96 (0.68–1.34)

0.82

18.6 (263)

1.49 (0.95–2.33)

0.082

Stillbirth

Stillbirth

15.5 (412)

0.80 (0.52–1.24)

0.32

  1. aFactors that were not significant in in the general ANOVA were not further evaluated with comparisons at factor level