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Table 2 Principal components analysis of CBQoL items

From: Development and validation of a questionnaire assessing the quality of life impact of Colour Blindness (CBQoL)

  Component
Items Health & Lifestyle Emotions Work
Not noticing change in colour of skin due to sunburn .810   
Difficulty choosing groceries due to colour .766   
Not noticing change in colour of mole on skin .763   
Can’t tell when food is cooked due to colour .755   
Difficulty choosing or buying clothes .749   
Being confused about colour of pills or other medication due to colour-coding .733   
Not noticing blood in stools (faeces) .718   
Difficulty knowing when fruit is ripe due to colour .711   
Difficulty reading maps (e.g. London Underground map) .707   
Not noticing a change in colour of urine .679   
Problems playing sports (e.g. colours of team clothing, colours of snooker balls etc) .630   
Feeling anxious because of issues caused by problems seeing colours   .880  
Feeling depressed because of issues caused by problems seeing colours   .846  
Feeling unconfident because of issues caused by problems seeing colours   .820  
Feeling embarrassed or humiliated because of CB issues   .816  
Feeling low self esteem because of issues caused by problems seeing colours   .778  
Feeling anxious because you might not realise when you can’t see a colour properly   .767  
Feeling different to other people because of issues caused by problems seeing colours   .720  
Felt that had let down self or others due to problems seeing colours   .692  
Avoiding conversations where colours are discussed   .627  
Being limited in choice of work or career    .754
Difficulty performing work or other activities (e.g. charts)    .658
Accomplishing less than would like at work or in career    .621