title: Nasal resistance in Japanese elementary schoolchildren: determination of normal value.
abstract: CONCLUSIONS
  Rhinomanometry is a useful method for evaluating nasal airway patency in schoolchildren, and we could confirm the validity of the results it produces.
  
  
  OBJECTIVE
  Our purpose was to assess the validity nasal resistance measurements produced using anterior active rhinomanometry by comparing the results with those of our previous study and to determine a normal value of the nasal resistance.
  
  
  METHODS
  Nasal resistance was measured by rhinomanometry in 852 children using the active anterior method.
  
  
  RESULTS
  Mean nasal resistance was 0.45 ± 0.70 Pa/cm(3)/s. Nasal diseases were noted in 358 (42%) children, and nasal condition was normal (the normal group) in 494 (58%) children. Nasal resistance was 0.57 ± 1.05 Pa/cm(3)/s in the nasal disease group and 0.35 ± 0.16 Pa/cm(3)/s in the normal group, showing that resistance was significantly higher in the nasal disease group. In the normal nasal groups, nasal resistance tended to be lower in the children in higher grades (first grade, 0.44 ± 0.17 Pa/cm(3)/s; second grade, 0.37 ± 0.11 Pa/cm(3)/s; third grade, 0.36 ± 0.23 Pa/cm(3)/s; fourth grade, 0.36 ± 0.14 Pa/cm(3)/s; fifth grade, 0.30 ± 0.08 Pa/cm(3)/s; sixth grade, 0.29 ± 0.11 Pa/cm(3)/s), and taller groups (<120 cm, 0.43 ± 0.16 Pa/cm(3)/s; 120-130 cm, 0.37 ± 0.19 Pa/cm(3)/s; 130-140 cm, 0.34 ± 0.12 Pa/cm(3)/s; >140 cm, 0.28 ± 0.09 Pa/cm(3)/s). Results similar to those seen in our previous study were obtained in each group.
authors.affiliation: Sleep Disordered Breathing Center, Ayagawa National Health Insurance Sue Hospital, 1720-1 Sue, Ayagawa, Kagawa, Japan. koryuichi@kzc.biglobe.ne.jp
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Kobayashi
authors.forename: Soichiro
authors.initials: S
authors.lastname: Miyazaki
authors.forename: Masayuki
authors.initials: M
authors.lastname: Karaki
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Hara
authors.forename: Astushi
authors.initials: A
authors.lastname: Kikuchi
authors.forename: Takuro
authors.initials: T
authors.lastname: Kitamura
authors.forename: Nozomu
authors.initials: N
authors.lastname: Mori
mesh_terms: D000403:Airway Resistance / Q000502:physiology*; D001827:Body Height / Q000502:physiology; D001835:Body Weight / Q000502:physiology; D002648:Child; D005260:Female; D006801:Humans; D006984:Hypertrophy; D007564:Japan; D008297:Male; D009296:Nasal Cavity / Q000502:physiology*; D009300:Nasal Septum / Q000002:abnormalities; D014066:Palatine Tonsil / Q000473:pathology; D012016:Reference Values; D012220:Rhinitis / Q000503:physiopathology; D025363:Rhinomanometry; D012852:Sinusitis / Q000503:physiopathology