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Table 3 Final Five Factor Solution of the TSS-IOP Items

From: A new measure of patient satisfaction with ocular hypotensive medications: The Treatment Satisfaction Survey for Intraocular Pressure (TSS-IOP)

TSS-IOP Items

Factors*

 

I

II

III

IV

V

EI_1: Bothered by prolonged burning or stinging

.784

  

.204

 

EI_2: Bothered by grittiness or sandiness in eyes

.778

    

EI_3: Bothered by dry eyes

.765

    

EI_4: Bothered by unpleasant feelings in/around eyes

.744

  

.268

 

CoU_1: Satisfaction w/ time of day to take medication

 

.898

.217

  

CoU_2: Satisfaction w/ times per day require to take med

 

.855

.206

  

CoU_3: Ease of remembering to take medication

 

.764

.270

  

EoU_1: Ability to accurately deliver drop in eye

  

.881

  

EoU_2: Ability to deliver the right amount of medication

 

.233

.858

  

EoU_3: Ease of positioning of head

 

.318

.756

  

HYP_1: Bothered by others reactions to your red eyes

   

.878

 

HYP_2: Self-conscious of eye redness

.350

  

.825

 

HYP_3: Concern over cosmetic appearance of eyes

   

.775

 

EFF_1: Prevention of future vision problems

    

.761

EFF_2: Reduction of current visual problems

    

.752

  1. * Note: Factor loadings of less than .2 have been omitted. Factor I Eye Irritation 17.2% Factor II Convenience of Use 16.1% Factor III Ease of Use 15.3%Factor IV Hyperemia 15.2% Factor V Effectiveness 8.1%