Table 1 Comparison of the mean “knowledge” in the first and second time in both control and training groups

2010/2011

Training group

241

11.6

2.3

13.6

2.3

<0.001

Control group

199

11.2

2.3

11.5

2.5

0.224

2011/2012

Training group

312

10.9

2.6

13.7

2.5

<0.001

Control group

248

10.6

2.7

11.7

2.4

<0.001

2012/2013

Training group

361

10.5

2.8

13.5

2.6

<0.001

Control group

326

10.4

2.3

11.3

2.3

<0.001