Table 5

- Binary logistic regression analysis results.

Characteristics	Single binary logistic regression					Multiple binary logistic regression*					Hosmer and Lemeshow test
Characteristics	β	SE	P-value	Exp (β)	95% CI	β	S.E.	P-value	Exp (β)	95% CI	Hosmer and Lemeshow test
Cough
Gender
Male	Ref
Female	0.093	0.220	0.673	1.097	0.71-1.68	-	-	-	-	-
Age, years
16-18	Ref					Ref
1-5	1.153	0.409	0.005	3.167	1.42-7.06	1.289	0.425	0.002	3.629	1.57-8.35
6-10	1.408	0.394	<0.001	4.089	1.88-8.85	1.554	0.408	<0.001	4.728	2.12-10.5	χ²=6.952
11-15	0.836	0.401	0.037	2.307	1.05-5.06	0.920	0.413	0.026	2.509	1.11-5.63	p=0.542
Exposed from
None	Ref					Ref
Mother	1.447	0.408	<0.001	4.250	1.91-9.44	1.594	0.425	<0.001	4.926	2.14-11.3
Father	0.840	0.267	0.002	2.317	1.37-3.91	0.921	0.273	0.001	2.511	1.47-4.29
Both	1.781	0.315	<0.001	3.201	3.20-10.9	1.845	0.323	<0.001	6.329	3.35-11.9
Saturation
Gender
Male	Ref
Female	0.244	0.358	0.496	1.276	0.63-2.57	-	-	-	-	-
Age, years
16-18	Ref
1-5	0.862	0.682	0.207	2.367	0.62-9.01	_-	_-	_-	_-	_-
6-10	1.189	0.648	0.066	3.282	0.92-11.6						χ²=0.001
11-15	0.897	0.655	0.171	2.452	0.68-8.8	-	-	-	-	-	p=0.999
Exposed from
None	Ref					Ref
Mother	2.673	0.734	<0.001	14.893	3.43-61.0	2.673	0.734	<0.001	14.893	3.43-61.0
Father	1.678	0.644	0.009	5.355	1.51-18.9	1.678	0.644	0.009	5.355	1.51-18.9
Both	3.056	0.644	<0.001	21.250	6.01-75.0	3.056	0.644	<0.001	21.250	6.01-75.08
Lidocaine use
Gender
Male	Ref
Female	-0.131	0.232	0.573	0.877	0.55-1.38
Age, years
16-18	Ref					Ref
1-5	0.950	0.435	0.029	2.585	1.10-6.07	1.065	0.455	0.019	2.901	1.18-7.08
6-10	1.306	0.415	0.002	3.690	1.63-8.32	1.479	0.432	0.001	4.388	1.88-10.2	χ²=7.759
11-15	0.727	0.425	0.087	2.069	0.90-4.75	0.805	0.440	0.067	2.237	0.94-5.29	p=0.355
Exposed from
None	Ref					Ref
Mother	1.664	0.460	<0.001	5.280	2.14-13.0	1.764	0.474	<0.001	5.838	2.30-14.7
Father	1.304	0.319	<0.001	3.686	1.97-6.88	1.384	0.324	<0.001	3.993	2.11-7.53
Both	2.277	0.357	<0.001	9.743	4.83-19.6	2.347	0.365	<0.001	10.456	5.11-21.3

β: regression coefficient, SE: standard error, CI: confidence interval, Ref: reference category, *Backward Wald