Incidence and challenges of helicopter emergency medical service (HEMS) rescue missions with helicopter hoist operations: analysis of 11,228 daytime and nighttime missions in Switzerland

Table 2 Linear Regression Models on Duration of HHO Missions

Variable	Multivariate Adjusted			Univariate Analysis
Variable	Estimate	95 % -C.I.	p-value	Estimate	95 % - C.I.	p-value
Night mission	10.76	8.54 to 12.98	< 0.001	12.72	10.34 to 15.10	< 0.001
Trauma	8.93	7.26 to 10.60	< 0.001	6.36	4.58 to 8.15	< 0.001
Intubation	13.00	8.68 to 17.32	< 0.001	27.30	23.65 to 30.96	< 0.001
NACA 4	15.10	13.84 to 16.37	< 0.001	15.02	13.74 to 16.30	< 0.001
NACA 5	19.81	17.24 to 22.39	< 0.001	23.19	20.92 to 25.46	< 0.001
NACA 6	17.50	10.84 to 24.16	< 0.001	24.06	18.08 to 30.05	< 0.001

Complete case analysis of 6,427 patients (excluded from the analysis were patients with NACA 0 and 7). Unit of estimates: minutes. Fit of the multivariate model: p < 0.001, Adj. R = 0.148. Night mission: day missions served as the reference group
Trauma: Medical diagnosis served as the reference group. NACA NACA was analysed as a factor variable, scores 1–3 were merged and served as the reference group

ISSN: 1757-7241