Perceived effectiveness rating scales applied to insomnia help-seeking messages for middle-aged Japanese people: a validity and reliability study

Table 3 Internal consistency of the comprehensibility and persuasiveness scales

	Overall scale score		Internal consistency among all items		Internal consistency among each scale items
	Mean	SD	Cronbach alpha	Item-total correlation	Cronbach alpha	Item-total correlation
(A) Comprehensibility scale	3.70	0.82	0.88		0.93
1) Read				0.54		0.80
2) Understand				0.58		0.87
3) Remember				0.57		0.81
4) Locate				0.59		0.83
5) Keep				0.65		0.77
(B) Persuasiveness scale	3.15	0.61			0.88
1) Believable				0.66		0.71
2) Convincing				0.64		0.73
3) Important				0.45		0.60
4) Confident				0.55		0.71
5) Friends				0.53		0.67
6) Positive thoughts				0.51		0.65
7) Agreeable				0.59		0.62

Overall scale scores were calculated as the average of the scale items scored on a 1-to-5 point Likert scale. Internal consistency was assessed among all items and also among each scale items

ISSN: 1347-4715