Table 2. Associations between 25-hydroxyvitamin D (25(OH)D) level and patients with narcolepsy-cataplexy.

	Normal controls N = 55		Narcolepsy with cataplexy N = 51
	n	%	n	%	OR [95%CI]	p-value *	OR [95%CI] **	p-value **
25(OH)D, nmol/L 1
<45.9	8	14.55	19	37.25	5.34 [1.65–17.27]	0.0023	3.63 [1.06–12.46]	0.0191
[45.9–70.4[	12	21.82	14	27.45	2.63 [0.84–8.17]		2.43 [0.76–7.77]
[70.4–89.3[	17	30.91	10	19.61	1.32 [0.42–4.15]		1.19 [0.37–3.85]
≥89.3	18	32.73	8	15.69	1		1

¹Quartile of the whole population.

*For variables with more than two categories, the p-value of the test for trend is given.

**Adjustment for BMI on two classes (<25 and ≥25 kg/m²).