Table 3. Proportion of agreement, expressed by k statistic different measures of asthma control in children and adolescents.

	ACT	Spirometric index	Completed 6MWT	6MWT%ROC-curve
GINA	k= 0.563	k= 0.144	k= 0.127	k= 0.67
	p<0.001	p= 0.091	p= 0.002	p= 0.026
	ACT	k= 0.096	k= 0.234	k= 0.196
		p= 0.212	p<0.001	p= 0.021
		Spirometric index	k= 0.017	k= 0.015
			p= 0.689	p= 0.839
			Completed 6MWT	k= 0.318
				p<0.001

GINA: Global Initiative for Asthma questionnaire; ACT: Asthma Control Test; Spirometric index: composed by VEF1, VEF1/FVC and FEF25-75%; Completed 6MWT: Completed Six-minute-walk-test regardless of the distance walked; 6MWT % Receiver Operating Characteristic (ROC)- curve: classification based on ROC-curve values of percentage-predicted distance walked in 6MWT.