. 2021 Apr 9;28(6):2065–2073. doi: 10.1111/ene.14796

TABLE 1.

Characteristics of patients with confirmed diagnosis, overdiagnosis and underdiagnosis of chronic inflammatory demyelinating polyradiculoneuropathy

	Confirmed diagnosis ^a (n = 65)	Overdiagnosis ^b (n = 31)	p ^c	Underdiagnosis ^d (n = 16)	p ^e
Age at first visit Erasmus MC, years	62 (17–82)	62 (38–88)	1.00	65 (52–81)	0.37
Male	62 (40)	68 (21)	0.56	81 (13)	0.14
Symptom duration ^f , months	9 (1–334)	24 (1–146)	0.05	24 (2–185)	0.23
Time since diagnosis ^g , months	3 (0–294)	3 (0–34)	0.88	2 (0–33)	0.43
Time carrying “wrong” diagnosis, months	NA	4 (0–34) ^h	NA	3 (0–44)ⁱ	NA
Delay in CIDP diagnosis ^j , months	9 (1–334)	NA	NA	24 (2–190)	0.53
Referred with CIDP + ≥1 diagnoses	37 (24)	26 (8)	0.28	NA	NA
Referred by teaching hospital	48 (31)	27 (8/30)	0.05	19 (3/16)	0.04

Data presented as percentages (number) or median (range).

Abbreviations: CIDP, chronic inflammatory demyelinating polyradiculoneuropathy; Erasmus MC, Erasmus University Medical Centre; NA, not applicable.

^{^a}

Confirmed diagnosis: patients referred with a diagnosis of CIDP that was confirmed at the Erasmus MC.

^{^b}

Overdiagnosis: patients referred with a diagnosis of CIDP that was revised to another diagnosis at the Erasmus MC.

^{^c}

Confirmed diagnosis vs. overdiagnosis.

^{^d}

Underdiagnosis: patients referred with another diagnosis that was revised to CIDP at the Erasmus MC.

^{^e}

Confirmed diagnosis vs. underdiagnosis.

^{^f}

Symptom duration: time between disease onset and date of referral diagnosis.

^{^g}

Time since diagnosis: time between date of referral diagnosis and first visit at Erasmus MC.

^{^h}

Time between date of referral diagnosis of CIDP and rejecting this diagnosis at Erasmus MC.

^ⁱ

Time between date of referral diagnosis and date of CIDP diagnosis at Erasmus MC.

^{^j}

Time between disease onset and CIDP diagnosis