Table 3.

The estimated coefficients (β) and 95% confidence interval (CI) for associations between ln-transformed somatic cell count (lnSCC), intramammary infection status^a and non-infectious factors (fixed effects). Based on 3125 samples from 451 Norwegian dairy goats in four herds. Goat nested within herd was included as random effect

Fixed effects	β	CI	p
(Intercept)	5.38	5.20–5.56	< 0.001
IMI-statusa
Negative	Reference
Staphylococcus aureus	1.60	1.22–1.97	< 0.001
Staphylococcus epidermidis	0.90	0.46–1.34	< 0.001
Staphylococcus caprae	0.41	0.08–0.73	0.015
Staphylococcus warneri	0.50	0.23–0.78	< 0.001
Other	0.10	-0.16–0.36	0.438
Sampling periodb
Indoor spring/early lactation	Reference
Pasture/mid lactation	1.29	1.21–1.37	< 0.001
Fall/late lactation	1.10	1.02–1.19	< 0.001
Parity
First	Reference
Second	0.78	0.63–0.93	< 0.001
Third	1.53	1.34–1.72	< 0.001
≥Fourth	1.39	1.23–1.55	< 0.001
Milk yieldc	-0.30	-0.36 – -0.25	< 0.001
Year
2021	Reference
2022	-0.34	-0.42 – -0.27	< 0.001
Interaction terms
IMI [S.aureus] * Parity [Second]	-0.33	-0.79–0.14	0.171
IMI [S.epidermidis] * Parity [Second]	-0.56	-1.09 – -0.04	0.036
IMI [S.caprae] * Parity [Second]	0.03	-0.36–0.43	0.868
IMI [S.warneri] * Parity [Second]	-0.11	-0.50–0.28	0.595
IMI [Other] * Parity [Second]	0.54	0.19–0.88	0.002
IMI [S.aureus] * Parity [Third]	-0.25	-0.82–0.32	0.387
IMI [S.epidermidis] * Parity [Third]	-0.80	-1.54 – -0.06	0.034
IMI [S.caprae] * Parity [Third]	-0.49	-0.99–0.02	0.059
IMI [S.warneri] * Parity [Third]	-0.55	-1.01 – -0.10	0.016
IMI [Other] * Parity [Third]	-0.23	-0.63–0.17	0.256
IMI [S.aureus] * Parity [≥ Fourth]	-0.58	-1.03 – -0.13	0.011
IMI [S.epidermidis] * Parity [> third]	-0.76	-1.29 – -0.24	0.005
IMI [S.caprae] * Parity [≥ Fourth]	-0.31	-0.70–0.08	0.124
IMI [S.warneri] * Parity [≥ Fourth]	-0.54	-0.90 – -0.19	0.003
IMI [Other] * Parity [≥ Fourth]	0.08	-0.23–0.38	0.622

^bEarly lactation: less than 100 days in milk, mid lactation: 100–180 days in milk, late lactation: >180 days in milk

^cKg milk at the day of recording