Table 2

Mean scores at baseline, and test–retest reliability of patient reported measures in paper and personal digital assistant (PDA) format

	Paper format					PDA format
	Score T1	SDD	LA	CV%	ICC	Score T1	SDD	LA	CV%	ICC
CV, coefficient of variation; ICC, intraclass correlation coefficient; LA, limits of agreement (that is, 95% confidence interval of the difference T1 minus T2); MHAQ, modified health assessment questionnaire; RADAI, rheumatoid arthritis disease activity index; SDD, smallest detectable difference (that is, 1.96 SD of the difference T1 minus T2); SF-36, short form 36 item health assessment questionnaire; VAS, visual analogue scale.
Pain VAS	28.8	16.3	−12.6 to 20.0	30.2	0.87	32.6	13.1	−9.4 to 16.8	22.6	0.92
Fatigue VAS	42.4	32.3	−22.4 to 42.2	44.6	0.69	39.9	28.8	−24.2 to 33.4	39.4	0.66
Patient global VAS	29.2	19.2	−14.8 to 23.5	35.0	0.77	31.6	16.6	−14.0 to 19.2	27.6	0.84
RADAI	3.16	1.11	−0.79 to 1.43	18.5	0.92	3.10	1.24	−1.00 to 1.48	21.0	0.89
MHAQ	1.51	0.16	−0.12 to 0.21	5.7	0.96	1.52	0.20	−0.19 to 0.21	6.66	0.94
SF-36
Physical	60.2	14.8	−13.2 to 16.4	12.4	0.91	58.8	12.7	−13.4 to 12.0	10.7	0.92
Mental	74.7	14.0	−16.2 to 11.8	9.3	0.85	70.5	11.9	−13.6 to 10.1	8.4	0.90
Pain	56.0	20.7	−19.1 to 22.2	18.6	0.73	50.2	18.2	−24.0 to 12.3	17.1	0.81
Vitality	47.9	18.2	−21.5 to 14.8	18.4	0.82	49.0	16.2	−18.9 to 13.5	16.3	0.84
General	52.3	12.4	−11.6 to 13.2	12.1	0.93	57.0	13.4	−13.3 to 13.4	11.9	0.81