Table 2.

Characteristics of the study population and comparison between patients with and without post-concussion syndrome (≥3 of the core post-concussion symptoms).

Characteristic	Group	Univariate		Multivariate
		Odds ratio	95% CI	Odds ratio	95% CI
Age		1.007	0.998; 1.016
Sex	Male	Ref
	Female	1.244	0.953; 1.625
Living situation	Not Alone	Ref
	Alone	1.219	0.903; 1.644
Educational level	Low	Ref		Ref
	Middle	0.679 *	0.490; 0.940	0.807	0.573; 1.136
	High	0.552 *	0.391; 0.778	0.664 *	0.462; 0.954
Injury mechanism	Home and leisure accident	Ref		Ref
	Road traffic accident	1.442 *	1.072; 1.940	1.493 *	1.079; 2.066
	Sports accident	0.494 *	0.293; 0.835	0.747	0.430; 1.300
	Occupational accident	1.320	0.769; 2.267	1.570	0.884; 2.789
Number of injuries	1	Ref
	2	1.210	0.865; 1.692	1.013	0.703; 1.460
	≥3	1.555 *	1.001; 2.415	1.174	0.707; 1.948
Type of injury	Other injuries	Ref		Ref
	Head injury	1.532 *	1.112; 2.111	1.485 *	1.023; 2.155
Chronic disease	No chronic disease	Ref		Ref
	1 chronic disease	2.337 *	1.710; 3.194	2.403 *	1.739; 3.319
	2 or more chronic diseases	3.932 *	2.740; 5.642	4.126 *	2.825; 6.026
Length of hospital stay		1.066 *	1.037; 1.095	1.058	1.029; 1.087

CI: Confidence Interval; * statistically significant.