Maximal inspiratory and expiratory flow at moderate altitude: a study of a Latin American population

BMC Pulmonary Medicine

Table 3 Regression models for the mean and the lower limit of normality for PEFm, PEFs and PIFs (n = 314)

Variable	Ln(PEFm)		Ln(PEFs)		Ln(PIFs)
Variable	Mean	LLN	Mean	LLN	Mean	LLN
Sex	0.11748^*	0.17012^*	0.08871^†	0.07958	0.04547	− 0.06546
Weight, kg	0.00312^*	0.00035	0.00275^†	0.00232	0.00647^†	0.00888
Height, cm	0.01175^*	0.01258^†	0.01262^†	0.01564^*	0.01340^†	0.01458^*
Age, years	0.03295^*	0.05106^†	0.04317^†	0.05954^†	0.03818^†	0.01657
Age², years	− 0.00042^*	− 0.00069^†	− 0.00057^†	− 0.00083^†	− 0.00053^†	− 0.00024
Constant	3.37938^*	2.89981^†	− 0.80658^†	− 1.70366^*	− 1.44864^†	− 2.01063
RMSE	0.16548	0.3334	0.16946	0.3439	0.30778	0.6486
R²	0.82		0.83		0.65
Pseudo-R²		0.62		0.65		0.46

*p-value < 0.05
^†p-value < 0.01
R², Coefficient of determination; Pseudo-R², pseudo coefficient of determination; RMSE, Root Mean Square Error; LLN, lower limit of normality; PEFm, PEFs and PIFs were transformed to log_n. All associations had a p < 0.01. PEFm, peak expiratory flow measured with mechanical device; PEFs, peak expiratory flow measured by spirometry; PIFs, peak inspiratory flow measured by spirometry

ISSN: 1471-2466