Table 3 Parental interest in offspring’s studies and help with homework assignments at age 16 in relation to trajectories of internalised mental health symptoms from age 16 to 43 in women and men. Odds ratios (OR) with 95 % confidence intervals (CI) for belonging to the different trajectory groups derived from multinomial regression analyses with the two predictors mutually adjusted. The odds ratios denote the change in odds for each additional level of the exposure (range 0–4)

 Model 1

1.02 (0.87 to 1.21)

Reference

1.00 (0.76 to 1.31)

0.77 (0.58 to 1.01)

0.67 (0.47 to 0.94)

 Model 2

0.97 (0.82 to 1.16)

Reference

1.02 (0.76 to 1.36)

0.79 (0.59 to 1.06)

0.65 (0.44 to 0.94)

 Model 3

0.93 (0.76 to 1.14)

Reference

1.15 (0.83 to 1.59)

0.88 (0.63 to 1.23)

0.89 (0.58 to 1.36)

 Model 1

1.23 (1.07 to 1.42)

Reference

0.92 (0.74 to 1.14)

0.81 (0.64 to 1.03)

0.89 (0.64 to 1.22)

 Model 2

1.24 (1.07 to 1.43)

Reference

0.91 (0.73 to 1.13)

0.81 (0.64 to 1.04)

0.86 (0.63 to 1.19)

 Model 3

1.24 (1.07 to 1.43)

Reference

0.90 (0.73 to 1.13)

0.81 (0.64 to 1.04)

0.86 (0.62 to 1.18)

 Model 1

1.04 (0.76 to 1.43)

Reference

1.04 (0.73 to 1.47)

0.69 (0.50 to 0.95)

0.78 (0.52 to 1.18)

 Model 2

0.99 (0.71 to 1.39)

Reference

1.06 (0.73 to 1.54)

0.67 (0.48 to 0.95)

0.75 (0.47 to 1.18)

 Model 3

0.92 (0.62 to 1.34)

Reference

1.26 (0.83 to 1.91)

0.72 (0.48 to 1.06)

1.01 (0.60 to 1.68)

 Model 1

1.29 (0.98 to 1.70)

Reference

0.88 (0.66 to 1.16)

0.75 (0.56 to 1.00)

0.78 (0.54 to 1.13)

 Model 2

1.27 (0.96 to 1.69)

Reference

0.86 (0.65 to 1.15)

0.74 (0.56 to 0.99)

0.76 (0.52 to 1.10)

 Model 3

1.28 (0.97 to 1.71)

Reference

0.85 (0.64 to 1.13)

0.74 (0.55 to 0.99)

0.74 (0.52 to 1.08)

 Model 1

1.01 (0.83 to 1.24)

Reference

0.94 (0.61 to 1.45)

1.13 (0.60 to 2.10)

0.43 (0.23 to 0.81)

 Model 2

0.96 (0.78 to 1.19)

Reference

0.94 (0.60 to 1.49)

1.28 (0.66 to 2.48)

0.43 (0.22 to 0.87)

 Model 3

0.94 (0.74 to 1.19)

Reference

0.94 (0.55 to 1.60)

1.61 (0.79 to 3.28)

0.69 (0.29 to 1.64)

 Model 1

1.23 (1.04 to 1.45)

Reference

0.98 (0.69 to 1.39)

0.97 (0.61 to 1.53)

1.27 (0.63 to 2.57)

 Model 2

1.25 (1.05 to 1.48)

Reference

0.98 (0.69 to 1.40)

1.01 (0.64 to 1.61)

1.26 (0.62 to 2.55)

 Model 3

1.25 (1.05 to 1.48)

Reference

0.98 (0.68 to 1.40)

1.01 (0.65 to 1.59)

1.28 (0.64 to 2.57)

 Model 1

0.90 (0.72 to 1.13)

Reference

1.00 (0.69 to 1.43)

1.07 (0.74 to 1.56)

1.01 (0.64 to 1.59)

 Model 2

0.85 (0.67 to 1.07)

Reference

0.96 (0.66 to 0.41)

1.07 (0.72 to 1.58)

0.93 (0.57 to 1.51)

 Model 3

0.82 (0.63 to 1.05)

Reference

1.04 (0.71 to 1.54)

1.05 (0.70 to 1.58)

1.10 (0.67 to 1.82)

 Model 1

1.09 (0.89 to 1.33)

Reference

0.77 (0.57 to 1.05)

0.78 (0.57 to 1.07)

0.84 (0.57 to 1.24)

 Model 2

1.12 (0.91 to 1.38)

Reference

0.76 (0.56 to 1.03)

0.79 (0.57 to 1.08)

0.81 (0.55 to 1.20)

 Model 3

1.12 (0.91 to 1.38)

Reference

0.76 (0.56 to 1.04)

0.79 (0.57 to 1.08)

0.83 (0.55 to 1.24)

 Model 1

1.27 (0.90 to 1.78)

Reference

1.44 (0.80 to 2.59)

0.54 (0.32 to 0.92)

0.41 (0.20 to 0.82)

 Model 2

1.26 (0.89 to 1.78)

Reference

1.58 (0.86 to 2.89)

0.54 (0.30 to 0.95)

0.44 (0.20 to 0.97)

 Model 3

1.25 (0.87 to 1.78)

Reference

1.59 (0.85 to 2.98)

0.54 (0.30 to 0.98)

0.41 (0.18 to 0.91)

 Model 1

1.40 (1.14 to 1.72)

Reference

1.08 (0.79 to 1.49)

0.81 (0.55 to 1.18)

0.90 (0.52 to 1.57)

 Model 2

1.39 (1.13 to 1.71)

Reference

1.10 (0.79 to 1.52)

0.82 (0.56 to 1.22)

0.97 (0.53 to 1.76)

 Model 3

1.39 (1.13 to 1.72)

Reference

1.10 (0.79 to 1.52)

0.82 (0.56 to 1.22)

0.97 (0.53 to 1.77)