Development and validation of the Japanese version of the Bedtime Procrastination Scale (BPS-J)

BMC Psychology

Table 6 I-T correlation, Cronbach’s α, and McDonald’s ω when each item is eliminated

	ICC of each item	Full item			Item 2 eliminated			Item2 & 3 eliminated
	ICC of each item	I-T correlation	α when each item eliminated	ω when each item eliminated	I-T correlation	α when each item eliminated	ω when each item eliminated	I-T correlation	α when each item eliminated	ω when each item eliminated
Item 1	0.59	0.60	0.84	0.84	0.71	0.86	0.86	0.74	0.87	0.87
Item 2	0.55	- 0.21	0.87	0.87	–	–	–	–	–	–
Item 3	0.46	- 0.47	0.85	0.86	- 0.58	0.88	0.88	–	–	–
Item 4	0.59	0.67	0.83	0.84	0.78	0.85	0.85	0.80	0.86	0.86
Item 5	0.57	0.64	0.84	0.84	0.74	0.86	0.85	0.76	0.86	0.86
Item 6	0.68	0.70	0.83	0.83	0.80	0.85	0.85	0.81	0.86	0.86
Item 7	0.62	- 0.68	0.83	0.83	- 0.76	0.85	0.85	- 0.75	0.86	0.86
Item 8	0.56	0.69	0.83	0.83	0.78	0.85	0.85	0.81	0.86	0.86
Item 9	0.49	- 0.58	0.84	0.85	- 0.66	0.87	0.86	- 0.63	0.88	0.88

ICC interclass correlation coefficient, I-T correlation item total correlation, α Cronbach’s α, ω McDonald’s ω, Full items the full-item model, Item 2 eliminated the Item 2 eliminated model, Items 2 and 3 eliminated the Items 2 and 3 eliminated model

ISSN: 2050-7283