Table 1.

Demographic data and the serum levels of vitamin B12, folate, ferritin, hemoglobin of the participants

	OLP (n = 236)	Health controls (n = 226)	P
Age a	51.70 ± 13.99	49.46 ± 17.26	0.127
Male-to-female ratio b	41:195	52:174	0.131
vitamin B12 (ng/L) c	261.00 ± 171.75	306.50 ± 220.5	< 0.001
folate (ng/ml) c	9.38 ± 5.90	11.50 ± 30.04	< 0.001
Ferritin (ng/ml) c
Male	126.80 ± 94.85	120.30 ± 130.38	0.629 c
Female	54.20 ± 101.8	38.65 ± 65.62	0.458 c
Hemoglobin (g/dL) c
Male	160.00 ± 18.50	156.00 ± 16.25	0.798 c
Female	136.00 ± 16.00	136.00 ± 14.25	0.845 c

SD Standard deviation; QR Quartile Range

^aIndependent-sample t test; Mean ± SD

^bChi-square test

^cWilcoxon’s rank-sum test, Median ± QR.