Incidence of childhood primary immune thrombocytopenic purpura.
There is a discrepancy in the reported incidence of childhood immune thrombocytopenic purpura (ITP) between Europe (2.9-5.3 per 100 000 persons) and Japan (1.91). Ise district is a suitable area in which to conduct epidemiological study because there is little fluctuation in the sociodemographic factors. We performed a retrospective population-based study to clarify the incidence of primary childhood ITP. We calculated person-years for children aged <15 years based on the Ise district demographics between 2002 and 2012. The calculated person-years were 298 533. The number of hospitalized patients in Ise district was 25 (M/F, 14/11) during the study period. The calculated incidence was therefore 8.4 per 100 000 person-years. It is possible that the difference in incidence between the present calculation and that of the European studies is due to variation in accuracy and/or registration criteria between the studies.
Department of Pediatrics, Ise Red Cross Hospital, Ise, Mie, Japan.
Masamune
M
Higashigawa
Department of Pediatrics, Ise Red Cross Hospital, Ise, Mie, Japan.
Takatoshi
T
Maeyama
Department of Pediatrics, Ise Red Cross Hospital, Ise, Mie, Japan.
Ayako
A
Yoshino
Department of Pediatrics, Ise Red Cross Hospital, Ise, Mie, Japan.
Kazuyuki
K
Matsuda
Department of Pediatrics, Ise Red Cross Hospital, Ise, Mie, Japan.
Mitsue
M
Ito
Department of Pediatrics, Ise Red Cross Hospital, Ise, Mie, Japan.
Tomoaki
T
Maji
Department of Pediatrics, Ise Red Cross Hospital, Ise, Mie, Japan.
Ryouji
R
Ichimi
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007113:Immunity, Innate; D015994:Incidence; D007223:Infant; D007564:Japan / Q000453:epidemiology; D008297:Male; D011159:Population Surveillance; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000453:epidemiology* / Q000276:immunology; D012042:Registries; D012189:Retrospective Studies; D012307:Risk Factors
child; immune thrombocytopenic purpura; incidence