Under pressure: comparing in situ and boat tagging methods using time-to-event analyses

Table 4 Cox proportional hazards models results for the best-fitting model at 4 and 6 days after tagging

Days after tagging	Factor	Coefficient	SE	Hazard ratio	95% CI	p
4	Tagging method: boat	Reference	–	–	–	–
	Tagging method: in situ	− 1.43	0.55	0.24	0.08–0.70	0.009*
	Tagging time	− 0.19	0.12	0.83	0.65–1.05	0.120
6	Tagging method: boat	Reference	–	–	–	–
6	Tagging method: in situ	− 1.38	0.48	0.25	0.10–0.64	0.004*

For the categorical covariates, the hazard ratio is the proportion of risk compared to the reference covariate. For the continuous covariates, the hazard ratio is the proportion of risk with an increase of 1 unit (e.g., 1 min). A variable with a hazard ratio close to a value of 1 has a marginal effect and a confidence interval (CI) spanning 1 has no effect on hazard. All models include probability of presence as the dependent variable and list independent variables included in the best-fitting models. p-values are from the log-rank test and asterisks indicate statistical significance

ISSN: 2050-3385