# Table 4

Means, correlation coefficients with intention to screen and R-squares for the explicit and implicit measures
No letter Letter (PHS + New) No letter vs. letter
(N = 713) (N = 735)
M (SD) r M (SD) r p
Implicit
D-600 reassured 0.25 (.32) .05 0.29 (.32) -.04 .05
D-600 threatening 0.16 (.35) .01 0.13 (.32) -.05 .05
D-600 annoying 0.25 (.32) -.03 0.17 (.33) -.00 <.001
Explicit
Intention to screen 1.42 (.76) 1.00* 1.74 (.94) 1.00* <.001
Attitude** 2.65 (.65) .35* 2.99 (.64) .40* <.001
Susceptibility** 1.58 (.69) .53* 1.75 (.77) .46* <.001
Severity of chlamydia (1–8) 5.08 (1.39) -.07 5.26 (1.38) -.07 .01
Unrealistic optimism 3.15 (.81) -.42* 3.08 (.82) -.36* .08
Subjective norm** 1.18 (.53) .65* 1.30 (.66) .50* <.001
Descriptive norm 1.95 (1.09) .44* 2.05 (1.08) .36* .09
Moral norm** 2.07 (1.08) .53* 2.36 (1.11) .59* <.001
Perceived behavioral control 4.22 (.93) .01 4.25 (.86) .00 .66
Outcome expectations 3.22 (1.21) .26* 3.44 (.1.14) .35* <.001
Barrier – don’t feel like taking it 3.28 (1.39) -.03 3.19 (.1.36) -.00 .19
R2 .56 .49

*correlation with intention: p < .001 (Bonferroni correction for multiple comparisons).

**significant predictors of intention in the multivariate linear model.

M = mean; (SD) = Standard Deviation. The D-600 scores are on a continuum, where a higher score indicates a more positive association with the variable. All explicit measures, except Severity, are from 1–5, where 5 indicates a higher score on the variable.

ten Hoor et al.

ten Hoor et al. BMC Public Health 2013 13:1091   doi:10.1186/1471-2458-13-1091