. Author manuscript; available in PMC: 2008 Jan 1.

Published in final edited form as: Ophthalmology. 2006 Nov 7;114(1):10–19. doi: 10.1016/j.ophtha.2006.08.031

Table 2.

Definitions of Baseline Candidate Variables for the Pooled Analyses

	OHTS	EGPS
Age	Age at baseline	same
IOP	Mean of right and left eyes using 4–6 IOP measurements per eye at the 2 Qualifying Visits and 2–3 IOP measurements per eye at the Randomization Visit	Mean of right and left eyes using 2–3 IOP measurements at the Eligibility Visit and 1 IOP measurement at the 6 month visit
CCT	Mean of right and left eyes of 5 measurements per eye taken at one visit using ultrasonic pachymeter	Same
Vertical Cup/Disc Ratio by Contour	Mean of right and left eye of estimates from stereophotographs by masked readers	Same
Visual Field Pattern Standard Deviation	Mean of right and left eyes of two normal and reliable baseline Humphrey 30-2 visual fields per eye done at qualifying visits	Mean of right and left eyes of two normal and reliable baseline Humphrey 30-2 visual fields or Octopus 32-2 visual fields per eye done at the qualifying visit Octopus loss variance converted to pattern standard deviation
History of Diabetes	Self-report at baseline	Self-report at baseline of diabetes and its treatment
History of Heart Disease	Self-report	Self-report

CCT Central corneal thickness

EGPS European Glaucoma Prevention Study

IOP Intraocular pressure

OHTS Ocular Hypertension Treatment Study