Variable	Values
Age	Integer (65-89)
Patient gender	Male, female
Race	White, black, Hispanic, other
Region	Northeast, Midwest, South, West
Plan type	HMO, PPO, other
LIS	Y/N
Rx-Risk-V	Integer (0-33)
Hypertension	Y/N
Hyperlipidemia	Y/N
Diabetes	Y/N
Congestive heart failure	Y/N
Joint disorders	Y/N
Muscle weakness/movement disorders	Y/N
Mental disorders	Y/N
Glaucoma	Y/N
Glaucoma surgery	Y/N
Glaucoma-related eye exam	Y/N
OAG diagnosed by ophthalmologist	Y/N
Number of pharmacies used	Integer
Number of physicians seen	Integer
New user	Y/N (N = continuing user)
Mail ordera	Y/N (N = retail)
Prescriber gendera	Male, female
Prescriber specialtya-	Ophthalmologist, optometrist, other
Formulary tiera	1, 2, other
Prescription sourcea	Written, fax, phone, electronic, other
Pre-index medical costs	Continuous (log adjusted)
Pre-index pharmacy costs	Continuous (log adjusted)

Note: Bold items retained in final model.

^aBased on index IOP-lowering medication prescription.

HMO = health maintenance organization; IOP = intraocular pressure;

LIS = low-income subsidy; OAG = open-angle glaucoma; PPO = preferred provider organization; Y/N = yes/no.