Evaluation of colour vision impairment during acute hypobaric hypoxia in aviation medicine: a randomized controlled trial

Table 1 Study comparisons and corresponding statistical analysis: statistical tests that were applied for the statistical analysis of each comparison based on recommended allocation requirements

Outcome	Comparison	Data type	Statistical model
Colour vision ability—WCCVT	Comparison between two study groups for one particular time point, i.e. Mo/60/10,000 peri vs. Mo/60/15,000 peri	Number of correctly identified plates	Mann–Whitney U test
	Comparison between particular time points within a study group, i.e. Mo/60/10,000 pre vs. Mo/60/10,000 peri		Friedman test
	Comparison between eye side within a particular study group, i.e. Mo/60/10,000 pre left eye vs. Mo/60/10,000 pre right eye		t test
	Correlation between scoring levels of the time point Peri and SpO₂ saturation levels	Number of correctly identified plates and SpO₂ saturation levels	Linear regression
Colour vision ability—WC-D15	Comparison between two study groups for one particular time point, i.e. Mo/60/10,000 pre vs. Mo/60/15,000 pre	S-Index, C-Index	Mann–Whitney U test
	Comparison between particular time points within a study group, i.e. Mo/60/10,000 pre vs. Mo/60/10,000 peri		Friedman test
	Comparison between eye side within a particular study group, i.e. Mo/60/10,000 pre left eye vs. Mo/60/10,000 pre right eye		t test
	Correlation between scoring levels of the time point Peri and SpO₂ saturation levels	C-Index	Linear regression

ISSN: 1880-6562