Table 2.

Model for influenza‐like illness (ILI)‐related emergency department (ED) visits for chief complaint cough and respiratory viruses, non‐pandemic seasons, 2004–2014, Edmonton, Alberta and surrounding areas (Total R ² = .77)^a

Variable		Parameter estimate	95% CI		P‐value
Intercept		−34.95	−41.95	−27.95	<0.0001
Temporal adjustment variables
Sine		5.26	4.51	6.01	<0.0001
Cosine		−2.04	−2.70	−1.38	<0.0001
Date		0.003	0.003	0.004	<0.0001
Christmas‐New Year holiday (Dec 24‐Jan 3)		13.95	11.80	16.09	<0.0001
Sunday (ref)		1.00	−	−	−
Monday		−2.29	−3.06	−1.51	<0.0001
Tuesday		−4.29	−5.10	−3.48	<0.0001
Wednesday		−4.71	−5.57	−3.84	<0.0001
Thursday		−6.01	−6.88	−5.14	<0.0001
Friday		−5.54	−6.36	−4.73	<0.0001
Saturday		−3.31	−4.08	−2.53	<0.0001
Virus	Lag (days)
Influenza Ab	0	−0.02	−0.15	0.12	0.79
	1	0.35	0.22	0.49	<0.0001
	2	0.34	0.21	0.47	<0.0001
	3	0.33	0.20	0.46	<0.0001
	4	0.20	0.069	0.34	0.0021
	5	0.03	−0.10	0.17	0.62
RSVc	0	0.09	−0.029	0.21	0.12
	1	0.14	0.023	0.26	0.015
	2	0.19	0.078	0.31	0.0007
	3	−0.04	−0.16	0.08	0.49
	4	−0.02	−0.14	0.10	0.77
	5	0.02	−0.10	0.14	0.77

^aTwo autoregressive terms were added to this model.

^bAdditive estimate = 1.24; Significant lags = day 1–4.

^cAdditive estimate =0.39; Significant lags = day 1–2.