title: Repeat sample intraocular pressure variance in induced and naturally ocular hypertensive monkeys.
abstract: OBJECTIVE
  To compare repeat-sample means variance of laser induced ocular hypertension (OH) in rhesus monkeys with the repeat-sample mean variance of natural OH in age-range matched monkeys of similar and dissimilar pedigrees.
  
  
  METHODS
  Multiple monocular, retrospective, intraocular pressure (IOP) measures were recorded repeatedly during a short sampling interval (SSI, 1-5 months) and a long sampling interval (LSI, 6-36 months). There were 5-13 eyes in each SSI and LSI subgroup. Each interval contained subgroups from the Florida with natural hypertension (NHT), induced hypertension (IHT1) Florida monkeys, unrelated (Strasbourg, France) induced hypertensives (IHT2), and Florida age-range matched controls (C). Repeat-sample individual variance means and related IOPs were analyzed by a parametric analysis of variance (ANOV) and results compared to non-parametric Kruskal-Wallis ANOV.
  
  
  RESULTS
  As designed, all group intraocular pressure distributions were significantly different (P < or = 0.009) except for the two (Florida/Strasbourg) induced OH groups. A parametric 2 x 4 design ANOV for mean variance showed large significant effects due to treatment group and sampling interval. Similar results were produced by the nonparametric ANOV. Induced OH sample variance (LSI) was 43x the natural OH sample variance-mean. The same relationship for the SSI was 12x.
  
  
  CONCLUSIONS
  Laser induced ocular hypertension in rhesus monkeys produces large IOP repeat-sample variance mean results compared to controls and natural OH.
authors.affiliation: Department of Ophthalmology, College of Medicine University of Florida, Gainesville, Florida 32610-0284, USA. wdawson@eye.ufl.edu
authors.forename: William W
authors.initials: WW
authors.lastname: Dawson
authors.forename: Judyth C
authors.initials: JC
authors.lastname: Dawson
authors.forename: George M
authors.initials: GM
authors.lastname: Hope
authors.forename: Dennis E
authors.initials: DE
authors.lastname: Brooks
authors.forename: Christine L
authors.initials: CL
authors.lastname: Percicot
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D004195:Disease Models, Animal; D007429:Intraocular Pressure / Q000502:physiology*; D053685:Laser Therapy / Q000009:adverse effects; D008253:Macaca mulatta; D008992:Monkey Diseases / Q000209:etiology / Q000503:physiopathology*; D009798:Ocular Hypertension / Q000209:etiology / Q000503:physiopathology* / Q000662:veterinary*; D012189:Retrospective Studies; D014065:Tonometry, Ocular; D014129:Trabecular Meshwork / Q000601:surgery