title: Population-based cross-sectional study on insulin resistance and insulin-secretory capacity in Japanese school children.
abstract: OBJECTIVE
  Little information is available regarding the status of insulin resistance (IR) and insulin deficiency (ID), as well as their relationship with obesity in children using the homeostasis model assessment (HOMA) in a population-based setting.
  
  
  METHODS
  The study included a total of 445 ninth-grade children participating in health check-up programs implemented in Tsunan Town, Niigata, Japan (boys/girls, 252/193 [participation rates: 98.1/95.5%]). HOMA of insulin resistance ≥2.5 was defined as IR, and HOMA of β-cell function <40 defined as ID.
  
  
  RESULTS
  The medians (25-75th percentiles) of HOMA of insulin resistance, HOMA of β-cell function, Disposition Index and body mass index in boys were 1.2 (0.8-1.7), 64 (44-93), 52 (43-64) and 19.2 (18.0-20.7) kg/m2, respectively, vs 1.5 (1.0-2.0), 86 (63-120), 60 (50-74) and 20.4 (18.9-22.0) kg/m2, respectively, in girls. The HOMA of insulin resistance, HOMA of β-cell function and Disposition Index values were significantly higher in the girls (P = 0.002, P < 0.001 and P < 0.001, respectively). Those with IR accounted for a significantly higher proportion of girls than boys (15.5/8.7%; P = 0.027); those with obesity accounted for 9.9/10.7% (boys/girls); and those with IR and obesity accounted for 2.4/4.7%. Those with ID accounted for a significantly higher proportion of boys than girls (20.6/8.8%; P = 0.001), whereas those with ID and obesity accounted for a very small proportion of either group (0.4/0.5%).
  
  
  CONCLUSIONS
  The presence of IR was higher among the girls. In contrast, ID was more frequent among the boys. The infrequent presence of ID among children might support the presence of non-obese type 2 diabetes adults in Japan.
authors.affiliation: Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.|Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
authors.forename: Rimei
authors.initials: R
authors.lastname: Nishimura
authors.affiliation: Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.|Tsunan Town Hospital, Niigata, Japan.
authors.forename: Hironari
authors.initials: H
authors.lastname: Sano
authors.affiliation: Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Onda
authors.affiliation: Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Tsujino
authors.affiliation: Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Ando
authors.affiliation: Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: Futoshi
authors.initials: F
authors.lastname: Ebara
authors.affiliation: Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Matsudaira
authors.affiliation: Tsunan Town Hospital, Niigata, Japan.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Ishikawa
authors.affiliation: Tsunan Town Hospital, Niigata, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Sakamoto
authors.affiliation: Jikei University School of Medicine, Tokyo, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Tajima
authors.affiliation: Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: Kazunori
authors.initials: K
authors.lastname: Utsunomiya
mesh_terms: D000293:Adolescent; D003430:Cross-Sectional Studies; D005260:Female; D006706:Homeostasis; D006801:Humans; D007328:Insulin / Q000378:metabolism*; D007333:Insulin Resistance; D000078790:Insulin Secretion; D007564:Japan / Q000453:epidemiology; D008297:Male; D009765:Obesity / Q000453:epidemiology* / Q000378:metabolism
chemical_list: D007328:Insulin
keywords: Children; Insulin deficiency; Insulin resistance