Table 3.

Concordance between the interviewer and SMS text messaging assessments.

Measurement		Interviewer assessment, mean (SD)	SMS text messaging assessment, mean (SD)		Pa value	Intraclass correlation coefficient	Kappa valueb	Area under the receiver operating characteristic curve	Sensitivityb	Specificityb
Depression
	Patient Health Questionnaire (2-item)	0.67 (1.27)	1.23 (1.79)		.13	0.32	0.19	0.84	0.34	0.89
	Patient Health Questionnaire (8-item)	3.29 (4.47)	3.89 (4.20)		.39	0.73	0.43	0.93	0.60	0.86
Anxiety (2-item Generalized Anxiety Disorder scale)		0.97 (1.49)	1.16 (1.63)		.64	0.54	0.35	0.76	0.50	0.89
Functional disability (Sheehan Disability Scale)		8.09 (6.40)	6.83 (8.03)		.16	0.54	0.13	0.94	0.59	1.00

^aP value was calculated by using a paired t test.

^bThe kappa statistic, sensitivity, and specificity were evaluated using a cutoff point of 3 for the 2-item Patient Health Questionnaire and 2-item Generalized Anxiety Disorder scale, 8 for the 8-item Patient Health Questionnaire, and 12 for the Sheehan Disability Scale.