Table 4 Model outcomes and parameter estimates.

Intercept

31.54 (1.16)

10.55 (0.53)

42.18 (1.55)

13.44 (0.86)

47.15 (1.17)

49.8 (1.17)

48.29 (1.1)

47.46 (1.45)

53.16 (1.28)

Time

− 0.23 (0.22)

− 0.05 (0.11)

− 0.27 (0.3)

0.49 (0.17)

0.23 (0.21)

− 0.42 (0.28)

− 0.32 (0.24)

− 0.16 (0.26)

0.49 (0.24)

Non-users

–

–

–

–

–

–

–

–

–

Occasional users

3.43 (1.7)

1.89 (0.8)

5.37 (2.29)

1.46 (1.28)

− 5.03 (1.73)

5.41 (1.73)

2.09 (1.62)

5.03 (2.14)

− 6.32 (1.88)

Consistent users

4.97 (1.48)

2.3 (0.69)

7.27 (1.99)

2.93 (1.12)

− 3.77 (1.51)

4.58 (1.51)

4.1 (1.41)

6.97 (1.87)

− 5.67 (1.64)

Males

–

–

–

–

–

–

–

–

–

Mean of females

5.31 (1.23)

1.26 (0.56)

6.48 (1.64)

1.69 (0.92)

− 2.25 (1.24)

2.42 (1.25)

3.68 (1.17)

5.36 (1.54)

− 3.61 (1.36)

Never smokers

–

–

–

–

–

–

–

–

–

Mean of former smokers

− 1.57 (1.66)

− 0.33 (0.75)

− 2 (2.22)

− 0.35 (1.24)

0.6 (1.68)

− 0.69 (1.69)

− 1.09 (1.58)

− 2.75 (2.09)

1.49 (1.84)

Mean of current smokers

2.14 (1.71)

0.79 (0.77)

2.83 (2.28)

3.58 (1.27)

− 4.49 (1.72)

7.21 (1.73)

1.1 (1.62)

0.92 (2.14)

− 2.4 (1.88)

Slope of occasional users

− 0.5 (0.58)

0.04 (0.28)

− 0.42 (0.78)

− 0.1 (0.45)

− 0.2 (0.55)

0.54 (0.74)

0.36 (0.62)

0.7 (0.69)

0.13 (0.64)

Slope of consistent users

− 0.36 (0.46)

0 (0.23)

− 0.39 (0.62)

− 0.33 (0.36)

− 1.01 (0.44)

0.38 (0.6)

− 0.01 (0.5)

− 0.31 (0.54)

− 0.4 (0.51)

Random effects

 SD intercept

7.69

3.59

10.39

5.89

7.88

7.64

7.22

9.68

8.43

 SD time

1.27

0.66

1.92

1.42

1.18

1.97

1.38

0.92

1.06

 Correlation: time-by-intercept

− 0.06

0.51

0.21

0.24

0.23

0.15

0.14

0.37

0.11

Residual SD

4.99

2.39

6.48

3.24

4.75

6

5.37

6.44

5.89