Table 2.

PD-1 and PD-L1 levels in LP patients and controls

	LP patients	95% Confidence interval			Control	P value
	Mean ± SD	Lower bound	Upper bound	Cutoff level	Mean ± SD
Lesional PD-1 (ng/mg protein)	3.00 ± 1.37	1.000	1.000	< 6	9.72 ± 1.69	< 0.001*
Nonlesional PD-1 (ng/mg protein)	5.58 ± 2.35	0.840	0.983	< 7.35	9.72 ± 1.69	< 0.001*
P value	< 0.001*
Lesional PD-L1 (ng/mg protein)	0.98 ± 0.51	1.000	1.000	< 2.15	4.09 ± 1.02	< 0.001*
Nonlesional PD-L1 (ng/mg protein)	1.97 ± 0.74	0.917	1.000	< 2.75	4.09 ± 1.02	< 0.001*
P value	< 0.001*

LP: lichen planus, SD: standard deviation, PD-1: programmed cell death protein-1, PD-L1: Programmed cell death ligand-1,*P < 0.001 is highly significant