Effect of oxygen supplementation on cognitive performance among HEMS providers after acute exposure to altitude: the HEMS II randomized clinical trial

Table 3 p-values of effects estimated by generalized estimating equations (GEE)

Test	Parameter	Condition	Day time	Session	Day time* Session	Gender	Age	Education	ISI	Overall baseline
PVT	Mean RT (≥ 355 ms)	0.017	0.714	0.681	0.017	0.485	0.917	0.884	0.026	< 0.001
	Performance score	0.904	0.837	0.686	0.854	0.002	0.096	0.337	0.192	< 0.001
	Number of lapses	0.694	0.867	0.704	0.710	0.164	0.662	0.229	0.623	< 0.001
DSST	N of correct responses	0.139	0.363	0.270	0.773	0.120	0.688	0.886	0.210	< 0.001
DSST	N of incorrect responses	0.527	0.778	0.889	0.736	0.194	0.669	0.190	0.589	< 0.001
2-BACK	N of correct responses (1st part)	0.618	0.344	0.921	0.630	0.431	0.888	0.589	0.780	0.214
	N of correct responses (2nd part)	0.890	0.679	0.840	0.713	0.032	0.893	0.007	0.254	< 0.001
	Mean RT 1st part	0.458	0.659	0.880	0.707	0.000	0.708	0.741	0.745	0.265
	Mean RT 2nd part	0.333	0.212	0.737	0.759	0.494	0.886	0.864	0.630	0.161
PEGBOARD	Dominant hand	0.506	0.001	0.116	0.061	0.470	0.029	0.821	0.516	< 0.001

An asterisk (*) placed between two factors indicates the interaction effect of those two factors. 2-BACK, 2-back Numerical task; DSST, Digit Symbol Substitution Test; ISI, Insomnia Severity Index; PEGBOARD, Grooved Pegboard test; PVT, Psychomotor Vigilance Test; RT, Reaction Time

ISSN: 1757-7241