Table 2	Correlation Matrix (Weighted) – Limitation Items

 	q3a	q4a	q7a	q8a	q10a	q11a	q12a	q13a	q14a	q15a	q16a	q17a	q18a	q19a	q20a	q21	q6a	q23a	q24a	q25a	q27a	q28a	
q3a	1.0																						
q4a	0.6	1.0																					
q7a	0.0	0.0	1.0																				
q8a	0.0	0.0	0.5	1.0																			
q10a	0.0	–0.1	0.0	0.0	1.0																		
q11a	0.0	–0.1	0.0	0.1	0.6	1.0																	
q12a	0.0	–0.1	0.1	0.1	0.5	0.5	1.0																
q13a	0.0	0.0	0.1	0.1	0.4	0.4	0.4	1.0															
q14a	–0.1	0.0	0.0	0.0	0.5	0.4	0.4	0.4	1.0														
q15a	0.0	–0.1	0.1	0.0	0.4	0.4	0.4	0.4	0.5	1.0													
q16a	0.0	–0.1	0.1	0.1	0.3	0.4	0.4	0.4	0.3	0.4	1.0												
q17a	0.0	0.0	0.1	0.1	0.4	0.4	0.4	0.3	0.4	0.5	0.5	1.0											
q18a	0.0	–0.1	0.1	0.1	0.2	0.2	0.3	0.3	0.2	0.2	0.4	0.3	1.0										
q19a	0.0	–0.1	0.0	0.0	0.2	0.3	0.4	0.2	0.3	0.3	0.4	0.3	0.4	1.0									
q20a	0.0	0.0	0.1	0.1	0.2	0.3	0.3	0.3	0.2	0.3	0.5	0.4	0.5	0.3	1.0								
q21	0.0	0.0	0.1	0.1	0.3	0.3	0.4	0.5	0.4	0.4	0.5	0.4	0.3	0.4	0.4	1.0							
q6a	0.1	0.1	0.1	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.1	1.0						
q23a	0.0	0.0	0.0	0.0	0.0	0.1	0.0	0.1	0.0	0.0	0.1	0.1	0.1	0.0	0.1	0.1	0.3	1.0					
q24a	0.1	0.0	0.0	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.3	0.4	1.0				
q25a	0.0	0.0	0.0	0.0	0.0	0.1	0.1	0.1	0.1	0.1	0.2	0.1	0.1	0.0	0.2	0.1	0.3	0.4	0.3	1.0			
q27a	0.0	–0.1	0.0	0.0	0.1	0.1	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.3	0.3	0.3	1.0		
q28a	0.0	–0.1	0.0	0.0	0.0	0.0	0.0	0.1	0.0	0.0	0.1	0.1	0.1	0.0	0.1	0.1	0.2	0.3	0.3	0.2	0.6	1.0	

Key to Table 2
(question numbers refer directly to the Disability Survey questionnaire)

q3a	Hearing a conversation with one person
q4a	Hearing a conversation with three people
q7a 	Seeing newspaper print 
q8a 	Seeing a face across a room
q10a 	Walking 350 metres 
q11a 	Walking up and down stairs
q12a 	Carrying 5 kilos while walking 10 metres
q13a 	Moving between rooms
q14a 	Standing for 20 minutes
q15a 	Bending down and picking something up off the floor
q16a 	Dressing and undressing yourself
q17a 	Cutting your own toenails
q18a 	Grasping or handling things like scissors or pliers
q19a 	Reaching in any direction
q20a 	Cutting own food
q21 	Getting in and out of bed by yourself
q6a 	Difficulty in speaking and being understood
q23a	Learning
q24a 	Remembering
q25a 	Needing support from others for intellectual disability
q27a 	Difficulty doing normal age-specific activities
q28a 	Difficulty communicating or socialising with others

On the basis of the grouping, respondent values on the six sets of items were combined to give scores on six composite disability variables. The grouping is shown in Table 3.