Validity and reliability of the Malay version of sleep apnea quality of life index – preliminary results

Table 6 Internal consistency reliability of the Malay version of SAQLI

Domain/item	Corrected item-total correlation	Cronbach’s alpha if item deleted	Cronbach’s alpha for domain
Daily functioning (18 items)			0.978
A1	0.885	0.977
A2	0.782	0.978
A3	0.869	0.977
A4	0.854	0.977
A5	0.859	0.977
A6	0.856	0.977
A7	0.852	0.977
A8	0.794	0.978
A9	0.760	0.978
A10	0.795	0.978
A11	0.916	0.976
B5	0.752	0.978
B7	0.882	0.977
D1	0.869	0.977
D2	0.861	0.977
D3	0.838	0.977
D4	0.852	0.977
D5	0.793	0.978
Social interactions (13 items)			0.980
B1	0.802	0.979
B2	0.837	0.979
B3	0.917	0.977
B4	0.917	0.977
B6	0.919	0.977
B8	0.914	0.977
B9	0.914	0.977
B10	0.938	0.977
B11	0.916	0.977
B12	0.892	0.978
B13	0.913	0.977
C1	0.797	0.980
C6	0.778	0.980
Emotional functioning (9 items)			0.947
C2	0.794	0.940
C3	0.886	0.935
C4	0.913	0.933
C5	0.887	0.935
C7	0.851	0.937
C8	0.890	0.935
C9	0.776	0.941
C10	0.551	0.951
C11	0.538	0.952
Total scale			0.987

ISSN: 1477-7525