. 2021 May-Jun;47(3):e20200473. doi: 10.36416/1806-3756/e20200473

Table 4. Descriptive statistics, correlation coefficients, and multiple regression coefficients for the peak inspiratory flow rates and explanatory variables (height and S-index) in the asthma group.^a .

Variable	n	Mean	SD	r*	Regression coefficient (95% CI)	p**
PIF, L/s	44	4.3	0.9	-	-	-
Height, cm	44	156.4	12.2	0.56	0.012 (0.006-0.019)	< 0.001
S-index	44	51.9	15.2	0.96	0.05 (0.05-0.06)	< 0.001

PIF: peak inspiratory flow. ^aThe initial explanatory variables were those showing a p < 0.20 in Tables 2 and 3 (age, height, weight, S-index, BMI, level of physical activity, and level of asthma control). Multiple regression constant = −0.19. *Pearson’s correlation coefficient. **Student’s t-test.

Table 4. Descriptive statistics, correlation coefficients, and multiple regression coefficients for the peak inspiratory flow rates and explanatory variables (height and S-index) in the asthma group.a .

Table 4. Descriptive statistics, correlation coefficients, and multiple regression coefficients for the peak inspiratory flow rates and explanatory variables (height and S-index) in the asthma group.^a .