Dependent Variable

(I) Year

(J) Year

Mean Difference (I-J)

Std. Error

Sig.

95% Confidence Interval

Lower Bound

Upper Bound

Perceived Usefulness

First

Second

−1.50059^*

0.64301

0.021

−2.7685

−0.2327

Third

−1.92161^*

0.70587

0.007

−3.3134

−0.5298

Forth

−1.87940^*

0.81982

0.023

−3.4959

−0.2629

Fifth

−4.05797^*

1.69450

0.018

−7.3992

−0.7168

Second

First

1.50059^*

0.64301

0.021

0.2327

2.7685

Third

−0.42101

0.72367

0.561

−1.8479

1.0059

Forth

−0.37881

0.83519

0.651

−2.0256

1.2680

Fifth

−2.55738

1.70199

0.135

−5.9133

0.7986

Third

First

1.92161^*

0.70587

0.007

0.5298

3.3134

Second

0.42101

0.72367

0.561

−1.0059

1.8479

Forth

0.04221

0.88450

0.962

−1.7018

1.7862

Fifth

−2.13636

1.72672

0.217

−5.5411

1.2684

Forth

First

1.87940^*

0.81982

0.023

0.2629

3.4959

Second

0.37881

0.83519

0.651

−1.2680

2.0256

Third

−0.04221

0.88450

0.962

−1.7862

1.7018

Fifth

−2.17857

1.77635

0.221

−5.6811

1.3240

Fifth

first

4.05797^*

1.69450

0.018

0.7168

7.3992

Second

2.55738

1.70199

0.135

−0.7986

5.9133

Third

2.13636

1.72672

0.217

−1.2684

5.5411

Forth

2.17857

1.77635

0.221

−1.3240

5.6811