Table 3. Healthcare cost per patient over the 2-year follow-up.

	Cases			Controls			P value*	P value*
	N = 790			N = 790
Cost (2016 USD) per patient	Mean	SD	Median	Mean	SD	Median	Mean	Median
Outpatient Pharmacy	11,186	24,947	3,014	3,953	10,574	848	<.0001	<.0001
Medical	105,144	177,800	33,206	11,633	55,090	3,144	<.0001	<.0001
Inpatient	16,357	66,522	0	2,862	17,257	0	<.0001	<.0001
ER	1,188	5,168	0	468	2,215	0	<.0001	0.0003
Physician office	5,122	10,297	3,015	2,208	20,115	943	<.0001	0.0003
Outpatient surgery	3,204	8,172	809	1,157	4,372	0	<.0001	<.0001
Lab/pathology	2,907	11,012	1,120	648	1,903	278	<.0001	<.0001
Outpatient ancillary, radiology and HCPCS drugs	76,366	155,863	12,355	4,292	23,125	800	<.0001	<.0001
TOTAL COST	116,330	179,116	47,827	15,586	56,692	5,823	<.0001	<.0001
Total CIDP Therapy	59,619	136,892	59

*Paired t-test (mean) and the Wilcoxon signed-rank test (median).

CIDP = chronic inflammatory demyelinating polyneuropathy; ER = emergency room; HCPCS = Healthcare Common Procedure Coding System; USD = US dollar.