Table 2.

Regression coefficients (β) and p-values of the multiple regression models for eNO parameters in age group 6–11 years

	Interceptβ	Age			Gender			Height			BMI			Regions
		β	p-value		β	p-value		β	p-value		β	p-value		β	p-value	R 2	R2boot
FeNO50	1.718	0.054	< 0.001		-0.014	0.412		0.003	< 0.05		-0.001	0.958		0.026	0.116	0.036	0.036
FeNO200	2.308	0.011	0.704		-0.061	0.259		-0.001	0.784		-0.014	0.122		-	-	0.013	0.001
CaNO	2.750	0.014	0.786		-0.199	< 0.05		-0.012	0.148		0.012	0.485		-	-	0.020	0.009

The R² is the unadjusted coefficient of determination of the models and R² boot is the corresponding optimism- corrected R2 values as estimated by bootstrapping