A randomized trial of mailed questionnaires versus telephone interviews: Response patterns in a survey

Table 6 Odds ratios for more positive responses in telephone interviews

Theme	Number of mode-sensitive* items	Median (and maximum) odds ratio among mode-sensitive items	Number of mode-sensitive items	Median (and minimum^‡) odds ratio among mode-sensitive items
	with OR^†>1		with OR<1
Health behaviour
Medicine	0	-	0	-
Smoking	0		0	-
Self assessments
Self-esteem	4	1.99 (2.97)	4	0.88 (0.70)
Well-being	8	1.60 (2.01)	1	(0.75)
Depression	3	1.74 (1.82)	0	-
Stress	11	1.64 (2.27)	1	(0.73)

* Items where the hypothesis of identical distributions among telephone respondents and respondents to mailed questionnaires was rejected.
^† OR, odds ratio.
^‡ Since OR<1

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