Table 3.

Generalized estimating equations model for NRR EAdi estimated on 2-min time scale.

Variables	Wald chi-square	df	Significance
(Intercept)	31.8	1	<0.001
Time	15.2	4	<0.005
Ventilatory mode	3.2	2	0.198
Time * Vent. mode	2020	8	<0.001
Time * Vent. mode * NRR pressure	582.8	9	<0.001a

Vent. mode, ventilatory mode; df, degree of freedom.

^aIn subgroup comparisons, this interaction was significant for each between group comparison, i.e., NAVA vs. PSV, NAVA vs. PCV, and PSV vs. PCV (all p < 0.001).