Table 2 Significance tests for fixed effects from linear mixed effects models in all subjects (N = 1700)

Year

4

1040.666

< 0.001

Age

3

12.790

< 0.001

11.999

< 0.001

Age*Year

12

2.057

0.017

Gender

1

20.086

< 0.001

19.583

< 0.001

Gender*Year

4

0.918

0.453

Household composition

4

17.996

< 0.001

18.252

< 0.001

Household composition*Year

16

0.799

0.688

Prior nurse assistant training

1

20.586

< 0.001

20.836

< 0.001

Prior nurse assistant training*Year

4

0.576

0.680

Prior higher education

2

0.876

0.417

0.808

0.446

Prior higher education*Year

8

0.602

0.777

Prior work experience

3

4.438

0.004

4.375

0.005

Prior work experience*Year

12

1.258

0.238

University setting

1

3.495

0.062

2.775

0.096

University setting*year

4

3.915

0.004

Multivariable models**

Multivariable model***

Main effects only (a)

Main effects and interaction (b)

Main effects and interactions (c)

Factor

Df

F

p

F

p

F

p

Year

4

36.916

< 0.001

6.037

< 0.001

Age

3

2.526

0.056

2.442

0.063

2.191

0.087

Age*Year

12

1.337

0.191

1.660

0.070

Gender

1

26.765

< 0.001

26.312

< 0.001

26.002

< 0.001

Gender*Year

4

0.585

0.674

0.592

0.669

Household composition

4

14.201

< 0.001

14.281

< 0.001

12.433

< 0.001

Household composition*Year

16

1.087

0.361

1.107

0.342

Prior nurse assistant training

1

4.639

0.031

5.014

0.025

5.332

0.021

Prior nurse assistant training*Year

4

1.119

0.346

1.223

0.299

Prior higher education

2

0.585

0.557

0.634

0.530

0.596

0.551

Prior higher education*Year

8

0.719

0.675

0.653

0.733

Prior work experience

3

0.579

0.629

0.586

0.624

0.559

0.642

Prior work experience*Year

12

1.455

0.135

1.752

0.051

University setting

1

0.963

0.326

0.505

0.477

0.468

0.494

University setting*year

4

3.917

0.004

3.954

0.003