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Table 5 Reliability of the 22-item MacDQoL scale, with N/A items scored as zero (Cronbach's alpha = 0.9440)

From: +Psychometric evaluation of the MacDQoL individualised measure of the impact of macular degeneration on quality of life

MacDQoL
item
Scale mean if
item deleted
Scale variance if
item deleted
Corrected
item-total
correlation
Alpha if
item deleted
household tasks -71.92 1890.0 0.65 0.9414
personal affairs -71.19 1855.3 0.68 0.9408
shopping -71.53 1876.8 0.68 0.9410
personal relationship -74.74 1967.5 0.39 0.9446
family -72.93 1879.3 0.58 0.9426
friends and social -72.80 1875.0 0.66 0.9412
appearance -73.65 1915.5 0.54 0.9428
do physically -71.57 1858.6 0.72 0.9402
get out and about -71.32 1838.4 0.74 0.9399
holidays -73.16 1882.9 0.61 0.9419
hobbies/leisure -70.87 1874.7 0.71 0.9405
confidence -71.66 1879.3 0.63 0.9417
motivation -72.83 1876.9 0.68 0.9409
people's reaction -74.16 1918.8 0.55 0.9427
future -72.03 1909.2 0.52 0.9433
financial situation -74.89 1987.8 0.33 0.9452
independence -70.57 1822.7 0.80 0.9390
do for others -71.45 1847.3 0.71 0.9404
mishaps -72.31 1839.5 0.76 0.9397
meals -73.30 1882.1 0.68 0.9410
time -72.88 1870.7 0.69 0.9408
nature -72.08 1866.9 0.67 0.9410