Prevalence of IgG4-Related Disease in Japan Based on Nationwide Survey in 2009

Table 1

Stratification and selection of hospitals and survey results.

Stratification	Hospitals nominated	Department nominated	Departments replying	Reply rate (%)
University hospital	49	245	58	23.7
Particular hospital^a	55	275	96	34.9
≥500 beds	72	360	99	27.5
400–499 beds	33	165	38	23.0
300–399 beds	27	135	33	23.0
200–299 beds	12	60	10	16.7
100–199 beds	1	5	0	0
≤99 beds	1	5	0	0
Total	250	1250	301	26.6

^aHospitals considered to have collected AIP cases for research purposes.