Table 2.

 Differences in outcome between screening attenders and control participants, and between participants who screened positive and those who screened negative (random blood glucose test), at initial time point*. Values are means (standard deviations) unless stated otherwise

Variables	Control, non-screening	Screening attenders	Difference† (95% CI), P value‡	Screen negative at RBG	Screen positive at RBG	Difference§ (95% CI), P value‡
Self reported health	3.14 (0.85), n=253	3.10 (0.88), n=3199	−0.02 (−0.18 to 0.14), 0.81	3.17 (0.87), n=2057	2.97 (0.89), n=1142	−0.19 (−0.25 to −0.13), <0.001
State anxiety	32.7 (11.5), n=199	32.7 (11.6), n=2468	−0.53 (−2.60 to 1.54), 0.62	32.4 (11.4), n=1594	33.1 (11.9), n=874	0.93 (−0.02 to 1.88), 0.05
HADS anxiety	6.42 (4.39), n=255	6.04 (3.79), n=3140	−0.46 (−0.99 to 0.07), 0.12	6.07 (3.75), n=2016	5.97 (3.87), n=1124	−0.00 (−0.28 to 0.27), 0.99
HADS depression	4.52 (3.48), n=256	4.24 (3.31), n=3161	−0.37 (−0.93 to 0.18), 0.21	4.14 (3.24), n=2032	4.41 (3.43), n=1129	0.32 (0.08 to 0.56), 0.01
Worry about diabetes	7.95 (2.44), n=255	8.04 (2.20), n=3127	0.03 (−0.36 to 0.42), 0.90	7.97 (2.19), n=2019	8.18 (2.21), n=1108	0.25 (0.09 to 0.41), 0.002

HADS=hospital anxiety and depression scale; RBG=random blood glucose test.

*Immediately after initial (random blood glucose) test for screening attenders, first contact for control participants.

†Screening attenders minus controls.

‡Adjusted for age and comorbidity (use of antihypertensives).

§Participants who screened positive minus participants who screened negative.