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Table 2 Scales and items used to measure (psychosocial) correlates of STI testing (n = 501)

From: Correlates of STI testing among vocational school students in the Netherlands

Determinant (range) No. of items Internal consistency
(a)
Total
mean
Score
N = 501
SD Boys
Mean score
N = 281
SD Girls
Mean score
N = 220
SD
Intention to test * 2 0.75 0.10 1.01 0.01 1.03 0.21 0.99
Attitude toward testing ** 4 0.82 0.44 0.92 0.31 0.90 0.60 0.92
Advantages of testing *** 10 0.83 0.79 0.67 0.68 0.76 0.92 0.50
Disadvantages of testing *** 7 0.71 -0.19 0.70 0.08 0.75 0.32 0.62
Injunctive norm - friends and parents ** 4 0.71 0.09 0.81 0.00 0.80 0.21 0.81
Support - friends and parents ** 4 0.73 0.71 0.79 0.63 0.84 0.81 0.71
Test behavior - partner *** 1   -0.26 1.02 -0.31 0.89 -0.21 1.18
Injunctive norm - partner * 1   -0.14 0.90 -0.06 0.76 -0.23 1.04
Support - partner 2 0.69 0.62 0.86 0.43 0.77 0.87 0.92
Descriptive norm - friends 1   -0.34 1.03 -0.40 1.04 -0.27 1.00
Self efficacy *** 8 0.86 0.08 0.79 0.22 0.79 -0.11 0.74
Perceived susceptibility *** 5 0.88 0.88 0.82 0.67 0.87 1.15 0.67
Perceived severity 2 0.89 1.79 0.57 1.75 0.65 1.83 0.45
Perceived shame *** 5 0.86 0.45 0.95 0.23 0.96 0.73 0.86
Perceived stigma 6 0.84 -0.21 0.86 -0.22 0.86 -0.20 0.86
Knowledge *** 10 0.76 7.23 2.50 6.72 2.66 7.87 2.1
Test site characteristics ** 8 0.80 0.43 0.70 0.34 0.73 0.54 0.64
  1. Note: Differences in scores between boys and girls were tested using independent sample t-tests by gender
  2. * p < .05 (for gender difference); ** p < .01 (for gender difference); *** p < .001 (for gender difference); all items were measured on scales ranging from -2 to +2 (fully disagree/certainly not to fully agree/certainly) except for knowledge that was measured with a range of 0 to 10 (numbers represent number of right answers).