Table 8.

Regression analysis for the outcome variables represented by Influenza-Like Illnesses (ILI) estimates and main assessed keywords from Google Trends^TM, and topics from Italian Wikipedia, that in univariate analysis were associated by Spearman’s test p < 0.001. Analyses were performed by total sample (i.e., Total), and age groups 0–4 years, and 5–14 years.

Variable	ILI Age Group	B	95%CI		β	t	p Value
Bronchiolitis	TOTAL	0.030	−0.006	0.066	0.141	1.654	0.101
	0–4 yrs	0.133	0.015	0.251	0.210	2.223	0.028
	5–14 yrs	0.057	−0.139	0.057	0.147	1.688	0.094
Respiratory Syncytial Virus	TOTAL	−0.028	−0.080	0.023	−0.088	−1.095	0.276
	0–4 yrs	−0.094	−0.273	0.085	−0.098	−1.043	0.299
	5–14 yrs	−0.041	−0.139	0.057	−0.070	−0.831	0.407
Bronchitis	TOTAL	0.115	0.051	0.178	0.588	3.586	<0.001
	0–4 yrs	0.568	0.404	0.732	0.983	6.857	<0.001
	5–14 yrs	0.200	0.080	0.320	0.563	3.294	0.001
Pneumonia	TOTAL	−0.155	−0.250	−0.060	−0.560	−3.241	0.002
	0–4 yrs	-	-	-	-	-	-
	5–14 yrs	−0.374	−0.493	−0.255	−0.740	−6.226	<0.001
Fever	TOTAL	0.122	0.047	0.196	0.410	3.235	0.002
	0–4 yrs	0.056	−0.160	0.272	0.063	0.511	0.610
	5–14 yrs	0.174	0.066	0.304	0.322	2.638	0.009
Cough	TOTAL	−0.004	−0.076	0.068	−0.020	−0.110	0.913
	0–4 yrs	−0.208	−0.440	0.024	−0.342	−1.771	0.079
	5–14 yrs	−0.016	−0.155	0.122	−0.044	−0.236	0.814
Influenza	TOTAL	0.096	0.035	0.158	0.424	3.104	0.002
	0–4 yrs	0.038	−0.142	0.218	0.056	0.419	0.676
	5–14 yrs	0.219	0.104	0.335	0.529	3.753	<0.001
Common Cold	TOTAL	−0.081	−0.134	−0.029	−0.305	−3.061	0.003
	0–4 yrs	−0.056	−0.224	0.112	−0.071	−0.664	0.508
	5–14 yrs	−0.151	−0.251	−0.050	−0.310	−2.966	0.005
Decrease in appetite	TOTAL	0.017	−0.019	0.053	0.050	0.941	0.348
	0–4 yrs	0.109	−0.010	0.228	0.107	1.813	0.072
	5–14 yrs	0.040	−0.026	0.106	0.063	1.190	0.236
WIKI–Human Respiratory Syncytial Virus	TOTAL	0.001	−0.001	0.003	0.062	0.753	0.453
	0–4 yrs	0.005	−0.004	0.013	0.108	1.106	0.271
	5–14 yrs	0.002	−0.003	0.006	0.062	0.715	0.476
WIKI–Bronchiolitis	TOTAL	−0.008	−0.015	−0.001	−0.152	−2.173	0.032
	0–4 yrs	−0.041	−0.066	−0.016	−0.264	−3.262	0.001
	5–14 yrs	−0.019	−0.033	−0.006	−0.202	−2.782	0.006
WIKI–Influenza	TOTAL	0.001	0.000	0.001	0.198	1.494	0.138
	0–4 yrs	0.001	−0.001	0.002	0.066	0.885	0.378
	5–14 yrs	0.001	0.001	0.002	0.245	3.531	0.001
WIKI–Pneumonia	TOTAL	−0.001	−0.003	0.001	−0.164	−0.692	0.490
	0–4 yrs	-	-	-	-	-	-
	5–14 yrs	-	-	-	-	-	-
WIKI–Bronchitis	TOTAL	0.000	−0.004	0.004	−0.005	−0.054	0.957
	0–4 yrs	-	-	-	-	-	-
	5–14 yrs	−0.004	−0.010	0.002	−0.100	−1.368	0.174

Note: B = unstandardized regression coefficient; β = standardized regression coefficient; 95%CI = 95% confidence interval.