Infectious keratoconjunctivitis in semi-domesticated reindeer (Rangifer tarandus tarandus): a questionnaire-based study among reindeer herders in Norway and Sweden

Table 4 Results from a univariable mixed-effect logistic regression, where the observed presence of an outbreak of infectious keratoconjunctivitis in a herd for a given herding year was the outcome, with each observation under analysis being a herding year per herd (number of herd-years). Based on the 76 herders surveyed in the questionnaire regarding health and supplementary feeding of reindeer, 33 respondents from Norway and 43 from Sweden

Variable	Category	Numbers of herd-years	Numbers of herd-years with outbreak	Proportion	OR univariate	95% CI	P-value
Feeding overall	No	134	33	0.25	Reference
	Yes	284	93	0.33	1.30	0.15–11.58	0.82
Feeding in enclosure	No	276	68	0.25	Reference
	Yes	142	58	0.41	11.59	1.75–77.01	0.01
Free-range feeding	No	167	43	0.26	Reference
	Yes	251	83	0.33	0.29	0.05–1.72	0.17
Herd size	< 500	134	40	0.30	Reference
	500–999	83	29	0.35	1.54	0.02–123.80	0.85
	1000–1999	82	16	0.20	0.88	0.01–102.49	0.96
	> 1999	119	41	0.35	1.14	0.02–71.51	0.95
Regions	Norrbotten	129	45	0.35	Reference
	Västerbotten	56	15	0.27	1.33	0.01–211.03	0.91
	Dalarna/Jämtland	36	6	0.17	0.21	0.00–305.97	0.68
	Finmark	102	30	0.29	0.50	0.01–38.98	0.76
	Nordland/Troms	59	24	0.41	1.23	0.01–213.52	0.93
	Trondelag/Hedmark	36	6	0.17	0.21	0.00–305.94	0.68
Country	Norway	197	60	0.31	Reference
	Sweden	221	66	0.30	1.48	0.06–36.36	0.81
Herding year	2015–2016	67	17	0.25	Reference
	2016–2017	68	20	0.29	3.21	0.42–24.73	0.26
	2017–2018	67	18	0.27	1.36	0.17–11.02	0.77
	2018–2019	72	25	0.35	6.83	0.89–52.29	0.06
	2019–2020	72	26	0.36	10.14	1.29–79.90	0.03
	2020–2021	72	20	0.28	0.81	0.11–6.15	0.84

ISSN: 1751-0147